Database Flexibility (Need Expert Advice)
Mar 13, 2008
Hi All Professionals Programmers,
I would like to ask a question that is very important for me. The question is how can i create a flexible data base in which i m able to create the inner levels as much as i can.
Like i have a table building, then i have another child table floor, then the floor become parent and i have its child rooms, then the rooms become parent and i have its child floor tiles etc.
you can see i am going to inner dept, so i need a flexible database because its very costly and intimadting to change the database and every time create a new table and relationships.
Hope you have understood what i am going to say and need advice of professional and expert user to resolve it.
Any concise quality material like articles, white paper etc will also be suitable for me.
Thanks in Advance
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Feb 27, 2007
Hello,Consider I have a String:Dim MyString As String = "Hello"or an Integer:Dim MyInteger As Integer = 100or a class which its properties:Dim MyClass As New MyCustomClass
MyClass.Property1 = "Hello"
MyClass.Property2 = Unit.Pixel(100)
MyClass.Property3 = 100Or even a control:Dim MyLabel As Label
MyLabel.Id = "MyLabel"
MyLabel.CssClass = "MyLabelCssClass" Is there a way to save a String, an Integer, a Boolean, a Class, a Control in an SQL database?Something like: Define something (Integer, String, Class, Control, etc) Save in SQL 2005 Database Later in code Retrive from database given its IDIs this possible?How should I do this?What type of SQL 2005 table field should be used to store the information?Thanks,Miguel
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Feb 27, 2007
Hello,
I am using Enterprise Library Data Access and SQL 2005 application block and I need to know if it is possible to do the following:
Consider I have a String:
Dim MyString As String = "Hello"
or an Integer:
Dim MyInteger As Integer = 100
or a class which its properties:
Dim MyClass As New MyCustomClass
MyClass.Property1 = "Hello"
MyClass.Property2 = Unit.Pixel(100)
MyClass.Property3 = 100
Or even a control:
Dim MyLabel As Label
MyLabel.Id = "MyLabel"
MyLabel.CssClass = "MyLabelCssClass"
Is there a way to save a String, an Integer, a Boolean, a Class, a Control in an SQL database?
Something like:
Define something (Integer, String, Class, Control, etc)
Save in SQL 2005 Database
Later in code Retrive from database given its ID
Is this possible?
How should I do this?
What type of SQL 2005 table field should be used to store the information?
Thanks,
Miguel
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Jan 31, 2005
I have asked a similar question on SQLTemp.com, but I thought I would ask here in case there are people here that don't visit SQLTeam and can help me.
I have to tables:
tbSiteworkPriceList
ItemID | Descr | Material | Labour | Travel | Boarding
-----------------------------------------------------
1 | Finishing | 0.25 | 28 | 42 | 65
tbSiteworkCostTypes
CostTypeID | Descr
-------------------
1 | Materials
2 | Labour
3 | Travel
4 | Boarding
Now, the tabels above are a sitework price list for an estimating package. The tbSitworkCostTypes table is used to trace the value of the particular item back to an account after the item is added to a takeoff. My questions are:
1) How should I tie each items variable (Material, Labour, Travel, Boarding) to its appropriate cost type?
2) Should I divide the table tbSiteworkPriceList above into 2 tables as shown below?
tbSitworkPriceList
ItemID | Descr
1 | Finishing
tbSiteworkCostItems
fkItemID | fkCostTypeID | Price
-------------------------------------------
1 | 1 | 0.25
1 | 2 | 28
1 | 3 | 42
1 | 4 | 65
This seems to be a little better in the point of view that each item variable is linked to the appropriate cost item by joining the tables tbSiteworkCostItems to tbSiteworkCostTypes. They have to be linked because after the takeoff is generated, the dollar values have to be imported into an accounting system where the account code and cost type code are determined by the "CostTypeID". Any thoughts?
Mike B
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Apr 4, 2007
Hello friends,I have to design a database for banking application,but it is my first db design so i need some expert advice.
Data base has some performance constraint i.e high output ,minimum query time,need to process 2 to 5 million transaction per day.
Further specification can be revealed if appropriate help is provided.
your advice will be of great help for me.
Thx
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Aug 8, 2007
I would like to create a database that keeps track of our companies subject matter experts. I have roughed out some of the tables. I would appreciate any feedback on if this is the right approach and if there might be any issues when I start writting a front-end (probably VB 2005).
What makes this interesting (at least for me) is that a subject has an owner and at least 1 "expert", possibly up to 3. Here is what I am thinking for tables:
tblEmployee
EmployeeID (PK)
LastName
FirstName
etc......
tblSubject
SubjectID (PK)
Description
tblOwner
SubjectID (FK)
EmployeeID (FK)
tblExpert1
SubjectID (FK)
EmployeeID (FK)
tblExpert2
SubjectID (FK)
EmployeeID (FK)
tblExpert3
SubjectID (FK)
EmployeeID (FK)
Does this make sense? Would I run into any issues when trying to display this on a form in VB?
Thanks in advance for any help!!!!!
Cal
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Dec 8, 2007
Hi,I recently contacted my hosting company's customer support about my databases not working - saying that I use sql express (which they support).The guy recommended:
"I would suggest you to upgrade the db's to use mssql 2005." "This
is because, sql express is built for development environment. When you
are in development environment, you are accessing everything with
administrator permission. However, in live hosting environment (when
there are differnet kind of permission restrictions), sql express often
failed on attaching database." Does anyone have any opinion on that? Would it be best to change db's to use mssql 2005? How complicated/time consuming will it be to upgrade?Thanks!Jon
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Jun 4, 2007
I am thinking of doing a fake PC company site for my ASP project. so
what they will have is a chat, products with reviews, and users can
have "Buddies".So my DB so far (Tables):ProductPC - ID, Processor, RAM, HDD, Graphics, LCD ...ProductHardware
- ID, Title (Like "Intel C2D E6600"), Description, Price, Rating (0-5
stars, so integer), Category (CPU, HDD, Graphics)ProductSoftware - ID, Title (eg. "Adobe CS3"), Description, Price, Rating, Category (eg. Design, Programming)Reviews - ID, ProductID, Title, Content, DateChat - ID, TopicID, Title, Content, DateUsers - ID, Username, Password,The problem, how do i connect Reviews to the products since they are from diff tables.How do i get the "buddy" system workingChat i think its not as simple as thatBut i just need a simple ASP project, so no need to get too complex, but i still hope to learn as much.
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Jun 17, 2007
Hi,Apologies if this has already been asked, but I couldnt find a thread that asked exactly what I wanted.Im making an administration panel for a site where you can change various settings, options, and categories that data can fall into. When editing, adding or deleting a record i COULD make a trip to the database every time, but this feels very inefficient as I understand that establishing the connection is usually the biggest performance hit when querying a database.An alternative plan is for me to simply record the changes made in the panel and have a "save" button. When this is clicked, ONE database connection would be opened and all the data would be saved/updated/deleted as necessary. However, this would involve several "for" loops while the connection is open.The question is; which method would you recommend and why? And does having several "for" loops while the connection is open nullify the advantage gained by only opening one connection?Any advice would be very much appreciated. Thank you
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Dec 16, 2005
Hello,I am working on a web site which will use SQL 2005.I am planing my first SQL database and I am looking for advice.1. There will be two types of users: students and professors.2. Both users types will have login information. (Username, Password, AccessLevel) 3. The remaining information on students and professores is different. Student (Name, Email, Phone, ...) / Professor (Name, Email, Phone, Subjects, ...)4. Professors can publish documents. Each document has some info (Type, Title, Description, ...)My plan in this moment is to:A. Create the tables Students, Professors, Login and Documents.B. Students table would be connected to Login table. Professors table would be connected to Login table and Documents table.C. The field [Type] in documents table should include the type or should I create a table DocumentsTypes where I add codes for each type. I have seen this. What is the advantage?Can someone give me some advice?Thank you Very Much,Miguel
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Oct 19, 2007
Hello,
I am creating a database where:
- I have a Blogs and Folders system.
- Use a common design so I can implement new systems in the future.
Users, Comments, Ratings, View, Tags and Categories are tables common to all systems, i.e., used by Posts and Files in Blogs and Folders.
- One Tag or Category can be associated to many Posts or Files.
- One Comment, View or Rating should be only associated to one Post or one File. I am missing this ... (1)
Relations between a File / Folder and Comments / Ratings / View / Tags / Categories are done using FilesRatings, FoldersViews, etc.
I am using UniqueIdentifier as Primary Keys.
I checked ASP.NET Membership tables, a few articles and few features in my project, such as renaming files with the GUID of their records.
I didn't decided yet for INT or UNIQUEIDENTIFIER.
I am looking for some feedback on the design of my database.
One thing I need to improve is mentioned in (1)
Thank You,
Miguel
My Database Script:
-- Users ...
create table dbo.Users
(
UserID uniqueidentifier not null
constraint PK_User primary key clustered,
[Name] nvarchar(200) not null,
Email nvarchar(200) null,
UpdatedDate datetime not null
)
-- Categories ...
create table dbo.Categories
(
CategoryID uniqueidentifier not null
constraint PK_Category primary key clustered,
[Name] nvarchar(100) not null
)
-- Comments ...
create table dbo.Comments
(
CommentID uniqueidentifier not null
constraint PK_Comment primary key clustered,
AuthorID uniqueidentifier not null,
Title nvarchar(400) null,
Body nvarchar(max) null,
UpdatedDate datetime not null,
constraint FK_Comments_Users
foreign key(AuthorID)
references dbo.Users(UserID)
)
-- Ratings ...
create table dbo.Ratings
(
RatingID uniqueidentifier not null
constraint PK_Rating primary key clustered,
AuthorID uniqueidentifier not null,
Value float not null,
constraint FK_Ratings_Users
foreign key(AuthorID)
references dbo.Users(UserID)
)
-- Tags ...
create table dbo.Tags
(
TagID uniqueidentifier not null
constraint PK_Tag primary key clustered,
[Name] nvarchar(100) not null
)
-- Views ...
create table dbo.Views
(
ViewID uniqueidentifier not null
constraint PK_View primary key clustered,
Ticket [datetime] not null
)
-- Blogs ...
create table dbo.Blogs
(
BlogID uniqueidentifier not null
constraint PK_Blog primary key clustered,
Title nvarchar(400) null,
Description nvarchar(2000) null,
CreatedDate datetime null
)
-- Posts ...
create table dbo.Posts
(
PostID uniqueidentifier not null
constraint PK_Post primary key clustered,
BlogID uniqueidentifier not null,
AuthorID uniqueidentifier not null,
Title nchar(1000) null,
Body nvarchar(max) null,
UpdatedDate datetime not null,
IsPublished bit not null,
constraint FK_Posts_Blogs
foreign key(BlogID)
references dbo.Blogs(BlogID)
on delete cascade,
constraint FK_Posts_Users
foreign key(AuthorID)
references dbo.Users(UserID)
on delete cascade
)
-- PostsCategories ...
create table dbo.PostsCategories
(
PostID uniqueidentifier not null,
CategoryID uniqueidentifier not null,
constraint PK_PostsCategories
primary key clustered (PostID, CategoryID),
constraint FK_PostsCategories_Posts
foreign key(PostID)
references dbo.Posts(PostID)
on delete cascade,
constraint FK_PostsCategories_Categories
foreign key(CategoryID)
references dbo.Categories(CategoryID)
)
-- PostsComments ...
create table dbo.PostsComments
(
PostID uniqueidentifier not null,
CommentID uniqueidentifier not null,
constraint PK_PostsComments
primary key clustered (PostID, CommentID),
constraint FK_PostsComments_Posts
foreign key(PostID)
references dbo.Posts(PostID)
on delete cascade,
constraint FK_PostsComments_Comments
foreign key(CommentID)
references dbo.Comments(CommentID)
on delete cascade
)
-- PostsRatings ...
create table dbo.PostsRatings
(
PostID uniqueidentifier not null,
RatingID uniqueidentifier not null,
constraint PK_PostsRatings
primary key clustered (PostID, RatingID),
constraint FK_PostsRatings_Posts
foreign key(PostID)
references dbo.Posts(PostID)
on delete cascade,
constraint FK_PostsRatings_Ratings
foreign key(RatingID)
references dbo.Ratings(RatingID)
on delete cascade
)
-- PostsTags ...
create table dbo.PostsTags
(
PostID uniqueidentifier not null,
TagID uniqueidentifier not null,
constraint PK_PostsTags
primary key clustered (PostID, TagID),
constraint FK_PostsTags_Posts
foreign key(PostID)
references dbo.Posts(PostID)
on delete cascade,
constraint FK_PostsTags_Tags
foreign key(TagID)
references dbo.Tags(TagID)
)
-- PostsViews ...
create table dbo.PostsViews
(
PostID uniqueidentifier not null,
ViewID uniqueidentifier not null,
constraint PK_PostsViews
primary key clustered (PostID, ViewID),
constraint FK_PostsViews_Posts
foreign key(PostID)
references dbo.Posts(PostID)
on delete cascade,
constraint FK_PostsViews_Views
foreign key(ViewID)
references dbo.Views(ViewID)
on delete cascade
)
-- Folders ...
create table dbo.Folders
(
FolderID uniqueidentifier not null
constraint PK_Folder primary key clustered,
[Name] nvarchar(100) null,
Description nvarchar(2000) null,
CreatedDate datetime not null,
URL nvarchar(400) not null
)
-- Files ...
create table dbo.Files
(
FileID uniqueidentifier not null
constraint PK_File primary key clustered,
FolderID uniqueidentifier not null,
AuthorID uniqueidentifier not null,
Title nvarchar(400) null,
Description nvarchar(2000) null,
[Name] nvarchar(100) not null,
URL nvarchar(400) not null,
UpdatedDate datetime not null,
IsPublished bit not null,
Type nvarchar(50) null,
constraint FK_Files_Folders
foreign key(FolderID)
references dbo.Folders(FolderID)
on delete cascade,
constraint FK_Files_Users
foreign key(AuthorID)
references dbo.Users(UserID)
on delete cascade
)
-- FilesCategories ...
create table dbo.FilesCategories
(
FileID uniqueidentifier not null,
CategoryID uniqueidentifier not null,
constraint PK_FilesCategories
primary key clustered (FileID, CategoryID),
constraint FK_FilesCategories_Files
foreign key(FileID)
references dbo.Files(FileID)
on delete cascade,
constraint FK_FilesCategories_Categories
foreign key(CategoryID)
references dbo.Categories(CategoryID)
)
-- FilesComments ...
create table dbo.FilesComments
(
FileID uniqueidentifier not null,
CommentID uniqueidentifier not null,
constraint PK_FilesComments
primary key clustered (FileID, CommentID),
constraint FK_FilesComments_Files
foreign key(FileID)
references dbo.Files(FileID)
on delete cascade,
constraint FK_FilesComments_Comments
foreign key(CommentID)
references dbo.Comments(CommentID)
on delete cascade
)
-- FilesRatings ...
create table dbo.FilesRatings
(
FileID uniqueidentifier not null,
RatingID uniqueidentifier not null,
constraint PK_FilesRatings
primary key clustered (FileID, RatingID),
constraint FK_FilesRatings_Files
foreign key(FileID)
references dbo.Files(FileID)
on delete cascade,
constraint FK_FilesRatings_Ratings
foreign key(RatingID)
references dbo.Ratings(RatingID)
on delete cascade
)
-- FilesTags ...
create table dbo.FilesTags
(
FileID uniqueidentifier not null,
TagID uniqueidentifier not null,
constraint PK_FilesTags
primary key clustered (FileID, TagID),
constraint FK_FilesTags_Files
foreign key(FileID)
references dbo.Files(FileID)
on delete cascade,
constraint FK_FilesTags_Tags
foreign key(TagID)
references dbo.Tags(TagID)
)
-- FilesViews ...
create table dbo.FilesViews
(
FileID uniqueidentifier not null,
ViewID uniqueidentifier not null,
constraint PK_FilesViews
primary key clustered (FileID, ViewID),
constraint FK_FilesViews_Files
foreign key(FileID)
references dbo.Files(FileID)
on delete cascade,
constraint FK_FilesViews_Views
foreign key(ViewID)
references dbo.Views(ViewID)
on delete cascade
)
-- Run script
go
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Feb 13, 2008
I'm at a new installation where there's no DBA at all, so, as a Coldfusion programmer, I'm now the DBA, LOL.
The main SQL2000 DB we use is approximately 100MB with about 7MB of free space and is allocated to expand by 10%.
I am adding a new, large table, about 60 columns with lots of variable-length unicode fields, mostly nvarchar. It's being used to track non-USA user-form information. Even though the DB is set to expand, I'm concerned that due to the potential size/volume of records, that the auto-expand could cause performance issues.
The SQL2000 server has plenty of room, about 49GB, so I'm wondering if I should expand the size of the current DB, or if the auto-expand feature will be ok.
At this point I'm not sure what the volume of the user-form records will be in the new table. It won't be a million records certainly, but I'm guessing it could climb to maybe 10-20,000 records.
If I should expand the DB, can I do this while the DB is still online?
thanks...
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Jul 20, 2005
hi folks,i'm puzzled over this one, anyone with some solid db experience might beable to enlighten me here.i'm modelling a file system in a database as follows, and i can't figure outto cleanly implement an inheritance mechanism.i have a hierarchy of folders in an sql table. every folder has aparentFolderID, if this value is 0 then it means it's a root folder.then, in a 'files' table, every file has a parentFolderID to give it alocation in the structure. fairly basic.the hard part is that each file record has an attribute 'STYLE' that can beexplicitly specified, or inherited from it's parent folder, or it's parentsparent folder, or.. all the way back to the root.the 2 ways i've come up with representing it are:1) if the style is being inherited, enter a null value in the STYLE field.then to figure out what style applies to a file or folder, i trace backthrough it's parentFolderID records until i find a style attribute that isnot null.the good thing about this is that if i change the style that is applied tothe entire filesystem, it only takes one update.the bad thing is when i want to figure out what style applies to a file, ihave to traverse back through possibly several records to locate the folderthat actually specifies the style being inherited by the file.2) explicitly state all style values in each record.this is good for accessing the style of a file or folder because you get itstraight out first time from the db.the bad thing is if i update the entire file system, i might have severalhundred / thousand update sql statements to execute to update all the valuesin every folder and every file. nasty!thanks for any help, i'm really stumped with this and i'm thinking theremust be a more elegant way to implement inheritance.thankstim
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May 1, 2006
Hi,
I.m trying to find the best practice for my solution.
This is the situation.
My application has two databases and 2 client interface. One with a windows forms having a database (sql server 2000) running in an office (on a static IP but on a slow connection). the second one is an web application running on the net with an online database. Both these databases have to have same information. Users can add records to both databases independently but these databases should be synchronize at a point. I hope the situation is cleare. Is there a standard way of doing this. If some one knows good article of how this can be done pls forward it to me.
Many thanks.
-VJ
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Oct 21, 2007
Hello,
I am creating a database where:
- I have a Blogs and Folders system.
- Use a common design so I can implement new systems in the future.
Users, Comments, Ratings, View, Tags and Categories are tables common to all systems, i.e., used by Posts and Files in Blogs and Folders.
- One Tag or Category can be associated to many Posts or Files.
- One Comment, View or Rating should be only associated to one Post or one File. I am missing this ... (1)
Relations between a File / Folder and Comments / Ratings / View / Tags / Categories are done using FilesRatings, FoldersViews, etc.
I am using UniqueIdentifier as Primary Keys.
I checked ASP.NET Membership tables, a few articles and few features in my project, such as renaming files with the GUID of their records.
I didn't decided yet for INT or UNIQUEIDENTIFIER
I am looking for some feedback on the design of my database.
One thing I think need to improve is mentioned in (1)
But any advices to improve it would be great.
Thank You,
Miguel
My Database Script:
-- Users ...
create table dbo.Users
(
UserID uniqueidentifier not null
constraint PK_User primary key clustered,
[Name] nvarchar(200) not null,
Email nvarchar(200) null,
UpdatedDate datetime not null
)
-- Categories ...
create table dbo.Categories
(
CategoryID uniqueidentifier not null
constraint PK_Category primary key clustered,
[Name] nvarchar(100) not null
)
-- Comments ...
create table dbo.Comments
(
CommentID uniqueidentifier not null
constraint PK_Comment primary key clustered,
AuthorID uniqueidentifier not null,
Title nvarchar(400) null,
Body nvarchar(max) null,
UpdatedDate datetime not null,
constraint FK_Comments_Users
foreign key(AuthorID)
references dbo.Users(UserID)
)
-- Ratings ...
create table dbo.Ratings
(
RatingID uniqueidentifier not null
constraint PK_Rating primary key clustered,
AuthorID uniqueidentifier not null,
Value float not null,
constraint FK_Ratings_Users
foreign key(AuthorID)
references dbo.Users(UserID)
)
-- Tags ...
create table dbo.Tags
(
TagID uniqueidentifier not null
constraint PK_Tag primary key clustered,
[Name] nvarchar(100) not null
)
-- Views ...
create table dbo.Views
(
ViewID uniqueidentifier not null
constraint PK_View primary key clustered,
Ticket [datetime] not null
)
-- Blogs ...
create table dbo.Blogs
(
BlogID uniqueidentifier not null
constraint PK_Blog primary key clustered,
Title nvarchar(400) null,
Description nvarchar(2000) null,
CreatedDate datetime null
)
-- Posts ...
create table dbo.Posts
(
PostID uniqueidentifier not null
constraint PK_Post primary key clustered,
BlogID uniqueidentifier not null,
AuthorID uniqueidentifier not null,
Title nchar(1000) null,
Body nvarchar(max) null,
UpdatedDate datetime not null,
IsPublished bit not null,
constraint FK_Posts_Blogs
foreign key(BlogID)
references dbo.Blogs(BlogID)
on delete cascade,
constraint FK_Posts_Users
foreign key(AuthorID)
references dbo.Users(UserID)
on delete cascade
)
-- PostsCategories ...
create table dbo.PostsCategories
(
PostID uniqueidentifier not null,
CategoryID uniqueidentifier not null,
constraint PK_PostsCategories
primary key clustered (PostID, CategoryID),
constraint FK_PostsCategories_Posts
foreign key(PostID)
references dbo.Posts(PostID)
on delete cascade,
constraint FK_PostsCategories_Categories
foreign key(CategoryID)
references dbo.Categories(CategoryID)
)
-- PostsComments ...
create table dbo.PostsComments
(
PostID uniqueidentifier not null,
CommentID uniqueidentifier not null,
constraint PK_PostsComments
primary key clustered (PostID, CommentID),
constraint FK_PostsComments_Posts
foreign key(PostID)
references dbo.Posts(PostID)
on delete cascade,
constraint FK_PostsComments_Comments
foreign key(CommentID)
references dbo.Comments(CommentID)
on delete cascade
)
-- PostsRatings ...
create table dbo.PostsRatings
(
PostID uniqueidentifier not null,
RatingID uniqueidentifier not null,
constraint PK_PostsRatings
primary key clustered (PostID, RatingID),
constraint FK_PostsRatings_Posts
foreign key(PostID)
references dbo.Posts(PostID)
on delete cascade,
constraint FK_PostsRatings_Ratings
foreign key(RatingID)
references dbo.Ratings(RatingID)
on delete cascade
)
-- PostsTags ...
create table dbo.PostsTags
(
PostID uniqueidentifier not null,
TagID uniqueidentifier not null,
constraint PK_PostsTags
primary key clustered (PostID, TagID),
constraint FK_PostsTags_Posts
foreign key(PostID)
references dbo.Posts(PostID)
on delete cascade,
constraint FK_PostsTags_Tags
foreign key(TagID)
references dbo.Tags(TagID)
)
-- PostsViews ...
create table dbo.PostsViews
(
PostID uniqueidentifier not null,
ViewID uniqueidentifier not null,
constraint PK_PostsViews
primary key clustered (PostID, ViewID),
constraint FK_PostsViews_Posts
foreign key(PostID)
references dbo.Posts(PostID)
on delete cascade,
constraint FK_PostsViews_Views
foreign key(ViewID)
references dbo.Views(ViewID)
on delete cascade
)
-- Folders ...
create table dbo.Folders
(
FolderID uniqueidentifier not null
constraint PK_Folder primary key clustered,
[Name] nvarchar(100) null,
Description nvarchar(2000) null,
CreatedDate datetime not null,
URL nvarchar(400) not null
)
-- Files ...
create table dbo.Files
(
FileID uniqueidentifier not null
constraint PK_File primary key clustered,
FolderID uniqueidentifier not null,
AuthorID uniqueidentifier not null,
Title nvarchar(400) null,
Description nvarchar(2000) null,
[Name] nvarchar(100) not null,
URL nvarchar(400) not null,
UpdatedDate datetime not null,
IsPublished bit not null,
Type nvarchar(50) null,
constraint FK_Files_Folders
foreign key(FolderID)
references dbo.Folders(FolderID)
on delete cascade,
constraint FK_Files_Users
foreign key(AuthorID)
references dbo.Users(UserID)
on delete cascade
)
-- FilesCategories ...
create table dbo.FilesCategories
(
FileID uniqueidentifier not null,
CategoryID uniqueidentifier not null,
constraint PK_FilesCategories
primary key clustered (FileID, CategoryID),
constraint FK_FilesCategories_Files
foreign key(FileID)
references dbo.Files(FileID)
on delete cascade,
constraint FK_FilesCategories_Categories
foreign key(CategoryID)
references dbo.Categories(CategoryID)
)
-- FilesComments ...
create table dbo.FilesComments
(
FileID uniqueidentifier not null,
CommentID uniqueidentifier not null,
constraint PK_FilesComments
primary key clustered (FileID, CommentID),
constraint FK_FilesComments_Files
foreign key(FileID)
references dbo.Files(FileID)
on delete cascade,
constraint FK_FilesComments_Comments
foreign key(CommentID)
references dbo.Comments(CommentID)
on delete cascade
)
-- FilesRatings ...
create table dbo.FilesRatings
(
FileID uniqueidentifier not null,
RatingID uniqueidentifier not null,
constraint PK_FilesRatings
primary key clustered (FileID, RatingID),
constraint FK_FilesRatings_Files
foreign key(FileID)
references dbo.Files(FileID)
on delete cascade,
constraint FK_FilesRatings_Ratings
foreign key(RatingID)
references dbo.Ratings(RatingID)
on delete cascade
)
-- FilesTags ...
create table dbo.FilesTags
(
FileID uniqueidentifier not null,
TagID uniqueidentifier not null,
constraint PK_FilesTags
primary key clustered (FileID, TagID),
constraint FK_FilesTags_Files
foreign key(FileID)
references dbo.Files(FileID)
on delete cascade,
constraint FK_FilesTags_Tags
foreign key(TagID)
references dbo.Tags(TagID)
)
-- FilesViews ...
create table dbo.FilesViews
(
FileID uniqueidentifier not null,
ViewID uniqueidentifier not null,
constraint PK_FilesViews
primary key clustered (FileID, ViewID),
constraint FK_FilesViews_Files
foreign key(FileID)
references dbo.Files(FileID)
on delete cascade,
constraint FK_FilesViews_Views
foreign key(ViewID)
references dbo.Views(ViewID)
on delete cascade
)
-- Run script
go
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Feb 27, 2008
hi,
iam thinking of changing my ajax slideshow so that it gets the data from the databse. currently i am finding it hard to add text functianlity the way i want with the slide show.
what my query is, that if i to using a datalist can i add javasscript functionality to the data being retrived. for example, currently i have written some javascript so that a series of text is diplayed one after the other in a sequence from just one button click. so if im pulling data out of a databse can i still add this javascript functionality to it? i hope this makes sense, if it doesnt then i am willing to elaborate. please can any one offer any advice or examples or any suggestions on how i can do this. any help is much appricated as i am struggling to find a solution as i orinally wanted to be able to add this javascript functionality with the play button of the slide show but i couldnt find a solution.also i think its better to use some kind of database as i can use the editing funtions visual web developer offers
thank you
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May 22, 2008
Greetings,
Have an interesting issue in a database I'm trying to design and I'm trying to find a better way to setup the structure, if there is one. Going to generic example of my issue.
StudentList --- This table is the list of all College Students(with Primary Key of StudentID)
MajorsList --- This is a table listing all of the majors available at the College (PK of MajorID)
CourseList --- This is the list of all of the courses at the school (PK of ClassID)
This college allows students to take 1 or more majors, with the number of majors unknown.
-- Any number of students can take the same majors or different majors.
-- -- (aka 1 StudentID -> 1+ Majors & 1 Major -> 1+ StudentID's)
The majors all have different numbers of courses in them.
-- Many of the majors can have the same, or different courses in their lists.
-- -- (aka 1 Major -> 1+ Courses & 1 Course -> 1+ Majors)
I'm looking to see if their is a better way of tieing together the Students -> Majors and Majors -> Courses.
If done properlly, a single select and a few joins should bring up every class a student is taking for all their majors, or any other relationship to any of the three main tables primary keys.
Currently, to tie the three tables together, I have made two Interrum tables:
-- StudentMajors - - With only two columns
-- -- StudentID (ForeignKey tied to PrimaryKey StudentID in StudentList)
-- -- MajorID (FK tied to PrimaryKey MajorID in MajorList)
and
-- MajorCourses - - with only two columns
-- -- MajorID (FK tied to PrimaryKey MajorID in MajorList)
-- -- CourseID (FK tied to PrimaryKey CourseID in CourseList)
These tables give clear and definate ties between the tables, but my worry is that there is no primary key for these two tables, and no column in the tables is elledgeable for becoming PK, because, in this example the StudentMajors table can lis tthe studentID multiple times, each with a different MajorID. Sames goes with MajorCourses.
Is there a better structure method for reaching this same goal?
Additional, I don't know how to do a contraint that should be in place of:
-- In StudentMajors, for each value of studentID, there can be no duplicate values on MajorID
-- -- (same in MajorCourses tables in relations to classid's)
Any advice on how to do this constraint?
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Jun 2, 2008
Hello,
I have an asp.net application which connects to SQL Server 2005 database.
One out of 15 times (approx) the applicaiton does not make connection to the database and an exception is thrown.
I am not sure how to debug this. Should I write some code which can make connections in a loop to test how much stress the sever can handle?
Kindly suggest some ideas. Thanks.
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Aug 24, 2005
Dear GroupI'd be grateful if you can give me some advice on the following.An application I wrote uses an MSDE backend and I wonder whetherthere's a way (even for the system administrator) of not seeing ortracing stored procedure code, view and table designs?And I also wonder whether you can advise me on an installer thathandles MSDE and database setup during installation without too mucheffort but is still affordable < USD 1000.Any articles, resources, advice hints for these two topics are veryappreciated.Thank you very much for your help & efforts!Martin
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Jun 14, 2002
I am looking into a position requiring "SQL PLUS Expert" - anbody out there heard of this - is it a querying tool a la query analyzer of PL SQL.
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Jun 14, 2002
I am looking into a position requiring a "SQL PLUS Expert" - anybody out ther heard of this - is it a querying tool a la query analyzer or PL SQL ?
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Dec 11, 2006
Hello,
Lets just say that I have really only logged into phpmyadmin once and messed up my forum.
What I was trying to do? Install a shoutbox (chatroom type software).
When I logged into phpmyadmin I clicked the phpbb_config tab on the left hand side. Then I clicked the SQL tab and pasted the code required for the shoutbox accordingly and hit the "Go" button. But what I did next is what created problems.
I thought I may have put extra spaces or loaded the code wrong in the SQL area because the shoutbox did not work properly after everything was installed. So while in phpmyadmin and after clicking phpbb_config agian, instead of hitting SQL, I hit the "Empty" button thinking that I could just erase what I had previously inserted and then try inserting it again to make sure the code was inserted properly.
If you havn't figured it out by now, I clearly don't have a clue what I am doing, what exactly I did, or what I can do to fix it.
Click on the link to see the error..
http://www.cflzone.com/forum/index.php
Can someone that knows what they are doing please help me???
thanks,
- Reider
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Feb 20, 2001
Has anyone any suggestions how I might find the most recent of a series of dates from different tables? I am joining tables which all have a date_altered field and I am only interested in displaying the most recent of these. Eg.
select a.x,b.y,c.z, a.date_altered, b.date_altered, c.date_altered
from a inner join b on (a.id=b,id) inner join c on (b.id=c.id)
What I would like is in effect a function Highest() Eg.
select a.x,b.y,c.z, highest(a.date_altered, b.date_altered, c.date_altered) as last_alteration
from a inner join b on (a.id=b,id) inner join c on (b.id=c.id)
I am using SQL Server 7 so cannot write myself a function to achieve this - frustrating, as it is something I could have done 4 years ago when I used mostly Oracle.
Many thanks
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Jul 12, 2004
Fact is:
I have two tables Orderposreg and Temp1 (both in [My Database]), Orderposreg is from 1994, Temp1 from 1995 and i need to Update the old table with the new one.
This should my Query do: I need it to Update old primary keys, or if the row does not exist to insert the new primary key into the Orderposreg.
But if I start the Query i get this failure message:
Server: Msg 107, Level 16, State 1, Line 1
The column prefix 'dbo.Temp1' does not match with a table name or alias name used in the query.
It seems that the colums do not have the same name, but the column of both tables have exactly the same column name and data type just the table name is different.
For your information the whole Code:
Code:
declare @error varchar, @rowcount varchar
select count(*) from dbo.temp1
if (@@error <> 0)
begin
Print 'An error occurred reading the temporary import table'
goto exitpoint
end
begin transaction
update dbo.Orderposreg
set dbo.Orderposreg.Ordernr = dbo.Temp1.Ordernr,
dbo.Orderposreg.Pos = dbo.Temp1.Pos,
dbo.Orderposreg.Produktnr = dbo.Temp1.Produktnr,
dbo.Orderposreg.Artbenämn = dbo.Temp1.Artbenämn,
dbo.Orderposreg.Artikelgrupp = dbo.Temp1.Artikelgrupp,
dbo.Orderposreg.Förs_pris = dbo.Temp1.Förs_pris,
dbo.Orderposreg.Kvant = dbo.Temp1.Kvant,
dbo.Orderposreg.Total_Intäkt = dbo.Temp1.Total_Intäkt,
dbo.Orderposreg.SSort = dbo.Temp1.Sort,
dbo.Orderposreg.Datum = dbo.Temp1.Datum,
dbo.Orderposreg.Utskriven = dbo.Temp1.Utskriven,
dbo.Orderposreg.Levtid_Ö = dbo.Temp1.Levtid_Ö,
dbo.Orderposreg.Levtid_L = dbo.Temp1.Lev_kvant,
dbo.Orderposreg.Inköpskostnad = dbo.Temp1.Inköpskostnad,
dbo.Orderposreg.Vikt_tol = dbo.Temp1.Vikt_tol,
dbo.Orderposreg.AntalSt = dbo.Temp1.AntalSt,
dbo.Orderposreg.Spec_nr = dbo.Temp1.Spec_nr,
dbo.Orderposreg.Spec_utgåva = dbo.Temp1.Spec_utgåva,
dbo.Orderposreg.ID_Beräknad = dbo.Temp1.ID_Beräknad,
dbo.Orderposreg.Bredd = dbo.Temp1.Bredd,
dbo.Orderposreg.Tjocklek = dbo.Temp1.Längd,
dbo.Orderposreg.ValsnGrad_kod = dbo.Temp1.ValsnGrad_kod,
dbo.Orderposreg.Kant_Kod = dbo.Temp1.Kant_Kod,
dbo.Orderposreg.Planhets_kod = Temp1.Yt_kod,
dbo.Orderposreg.LevForm_kod = dbo.Temp1.LevForm_kod,
dbo.Orderposreg.Rakhets_kod = dbo.Temp1.Rakhets_kod,
dbo.Orderposreg.BreddTol_kod = dbo.Temp1.Breddtol_kod,
dbo.Orderposreg.TjocklTol_kod = dbo.Temp1.TjockTol_kod,
dbo.Orderposreg.LängdTol_kod = dbo.Temp1.LängdTol_kod,
dbo.Orderposreg.Stål_kod = dbo.Temp1.Stäl_kod,
dbo.Orderposreg.TotaltSek = dbo.Temp1.TotaltSek,
dbo.Orderposreg.Tullstatnr = dbo.Temp1.Tullstatnr,
dbo.Orderposreg.Fakturera = dbo.Temp1.Fakturera,
dbo.Orderposreg.Leveransstatus = dbo.Temp1.Leveransstatus,
dbo.Orderposreg.Momsbelopp = dbo.Temp1.Momsbelopp,
dbo.Orderposreg.Total_inkl_moms = dbo.Temp1.Total_inkl_moms,
dbo.Orderposreg.KloMPS = dbo.Temp1.KloMPS,
dbo.Orderposreg.ShopFloor = dbo.Temp1.ShopFloor,
dbo.Orderposreg.Status = dbo.Temp1.Status,
dbo.Orderposreg.Stålkod = dbo.Temp1.Stålkod,
dbo.Orderposreg.Kontonyckel = dbo.Temp1.Kontonyckel,
dbo.Orderposreg.PlanLevDat = dbo.Temp1.PlanLevDat,
dbo.Orderposreg.Legtillägg = dbo.Temp1.Legtillägg,
dbo.Orderposreg.StålGrp = dbo.Temp1.StålGrp,
dbo.Orderposreg.KundNr = dbo.Temp1.KundNr,
dbo.Orderposreg.FKundNr = dbo.Temp1.FKundNr,
dbo.Orderposreg.Godsmärke = dbo.Temp1.Godsmärke,
dbo.Orderposreg.LagerMtr = dbo.Temp1.LagerMtr,
dbo.Orderposreg.Sortkvant = dbo.Temp1.Sortkvant,
dbo.Orderposreg.Sortpris = dbo.Temp1.Sortpris,
dbo.Orderposreg.KundsProdNr = dbo.Temp1.KundsProdNr,
dbo.Orderposreg.Godsmärke2 = dbo.Temp1.Godsmärke2,
dbo.Orderposreg.RegDatum = dbo.Temp1.RegDatum,
dbo.Orderposreg.PlanBetDag = dbo.Temp1.PlanBetDag,
dbo.Orderposreg.Säkring = dbo.Temp1.Säkring
where dbo.Orderposreg.Ordernr_o_pos = dbo.Temp1.ordernr_o_pos
select @error = @@error,@rowcount=@@rowcount
if @error <> 0
begin
print ' Error updating - Error number '+@error+'. Rolling back'
--this reverses your updates
rollback
--this jumps to the end
goto exitpoint
end
print @rowcount+' rows updated'
insert into dbo.Orderposreg
(Ordernr, Pos, Ordernr_o_pos, Produktnr, Artbenämn, Artikelgrupp, Förs_pris, Kvant, Total_Intäkt, Sort, Datum, Utskriven, Levtid_Ö, Levtid_L, Lev_kvant, Inköpskostnad, Vikt_tol, AntalSt, Spec_nr, Spec_utgåva, ID_Beräknad, Bredd, Tjocklek, Längd, ValsnGrad_kod, Kant_kod, Planhets_kod, Yt_kod, LevForm_kod, Rakhets_kod, BreddTol_kod, TjocklTol_kod, LängdTol_kod, Stål_kod, TotaltSek, Tullstatnr, Fakturera_kvant, Leveransstatus, Fri_text, Momsbelopp, Total_inkl_moms, KloMPS, ShopFloor, Status, Stålkod_text, Kontonyckel, PlanLevDat, Legtillägg, StålGrp, KundNr, FKundNr, Godsmärke1, LagerMtr, Sortkvant, Sortpris, KundsProdNr, Godsmärke2, RegDatum, PlanBetDag, Säkring)
select
Ordernr, Pos, Ordernr_o_pos, Produktnr, Artbenämn, Artikelgrupp, Förs_pris, Kvant, Total_Intäkt, Sort, Datum, Utskriven, Levtid_Ö, Levtid_L, Lev_kvant, Inköpskostnad, Vikt_tol, AntalSt, Spec_nr, Spec_utgåva, ID_Beräknad, Bredd, Tjocklek, Längd, ValsnGrad_kod, Kant_kod, Planhets_kod, Yt_kod, LevForm_kod, Rakhets_kod, BreddTol_kod, TjocklTol_kod, LängdTol_kod, Stål_kod, TotaltSek, Tullstatnr, Fakturera_kvant, Leveransstatus, Fri_text, Momsbelopp, Total_inkl_moms, KloMPS, ShopFloor, Status, Stålkod_text, Kontonyckel, PlanLevDat, Legtillägg, StålGrp, KundNr, FKundNr, Godsmärke1, LagerMtr, Sortkvant, Sortpris, KundsProdNr, Godsmärke2, RegDatum, PlanBetDag, Säkring
from dbo.Temp1
where dbo.Temp1.Ordernr_o_pos not in (select Ordernr_o_pos from dbo.Orderposreg)
select @error = @@error,@rowcount=@@rowcount
if @error <> 0
begin
print ' Error inserting - Error number '+@error
print ' Rolling back updates and inserts'
--this reverses your updates and inserts
rollback
--this jumps to the end
goto exitpoint
end
print @rowcount+' rows were inserted'
--this saves your data
commit
exitpoint:
Thanks a million for somebody who helps me!!!
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Mar 16, 2004
Hi !
I have been worked with VC++, MS SQL SERVER, Transact-SQL for
3 years. I made an axtended stored procedure (xp_test) which returns
an recordset.
From Query Analizer, I can see the recordest : exec xp_test
I want to make an User Defined Function - MyTest which return
the recordset that it is returned by xp_test after its execution.
Something like that :
CREATE function dbo.MyTest ( )
RETURNS @table ...
AS
BEGIN
exec master.. xp_test table1 output -- can I do this ?
RETURN table1
END
Table and table1 are the same design.
Thank you very much !
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Oct 16, 2007
Is there a expert here on full text indexing on 2005 sql server express????
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Jul 23, 2005
I do a lot of hiring for my company and a lot of the people I interviewsay that they are experts at SQL queries, but when I give them somethingsimple just beyond the typical SELECT type of queries, they choke.For example I have a table that looks like this:PK_ID - primary keyPARENT_ID - a FK to another row in the same tableThis essentially is a tree structure. I will ask interviewees to writea query that will return all the rows that have 2 direct children. Noone knows how to do this.I don't get it. I have done queries which boggle the mind and they arefar more complex than this.Am I asking too much?--* Don VaillancourtDirector of Software Development**WEB IMPACT INC.*phone: 416-815-2000 ext. 245fax: 416-815-2001email: Join Bytes! <mailto:donv@webimpact.com>web: http://www.web-impact.com/ This email message is intended only for the addressee(s)and contains information that may be confidential and/orcopyright. If you are not the intended recipient pleasenotify the sender by reply email and immediately deletethis email. Use, disclosure or reproduction of this emailby anyone other than the intended recipient(s) is strictlyprohibited. No representation is made that this email orany attachments are free of viruses. Virus scanning isrecommended and is the responsibility of the recipient./
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Jan 28, 2008
Hi folks, I have a very typical database for an ASP.net application. There is a table which will contain a hierarchical data..much like files-folders structure of a file system.
But we know that the table will be a giant one in production. There will be a huge collection of data need to persist in it. we are already facing some performance problem with some queries during the QA/test machine.
Currently there is a table which is keeping all file and folder information and another table maintaing their hierarchy relation using two column namely, parentID and childID.
My first question is, would it be better to keep this hierarchy relation into the same table rather using a different one? (much like managerID and empID in AdventureWorks sample?)
My Second question, what is the best way to design this kind of structure to get the highest performance benifit?
All kind of thoughts will be appreciated much! thanks
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Oct 26, 2007
Hi,
I have a table describing items with 3 rows:
ID : its an identity Primary key
Type : nvarchar string for itemtype
ItemData : numeric data for an item
I would like to create a query to get the results where each returned row contains
- Type
- number of items for the given type
- concatenated string of the ItemData numbers for all items for the given type
ex: Items
1,"Big",1
2,"Big",56
3,"Small",45
4,"Big",22
Expected result:
"Big",3,"1 56 22"
"Small",1,"45"
I started with this query:
SELECT Type , COUNT(Type) AS Amount FROM Items GROUP BY Type
but i cannot figure out how to do the string concatenation (its like SUM but we dont need to add the values but we need to concatenate). I was thinking some stored procedure but this query will run on Compact SQL so thats not possible according to Compact SQL specs. Can any SQL expert help, how to do this, or is it possible to do anyhow?
Thanks for the help.
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Jan 30, 2008
Greetings!
I would like to create a database for keeping track of payroll data for employees where the supervisors (job coaches) on our workshop floor can use a Pocket PC device to record the hourly employee data on the fly. Then at the end of the day, the supervisor can place the device in a cradle of some sort and synch the newly entered data into the main database.
I'm guessing that SQL Server Compact edition would be perfect for this type of task? Is that correct? Can someone give me recommendations on how to go about setting this up? What should I use as the main database? SQL Server? Access? Any advice is appreciated!
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Apr 15, 2004
First i am designing a small database fo similar types of books ( Stories table , Short stories table , ...etc ) so i the columns in each table of them is similar , so instead of using a Stored Procedure for every table to select the TOP book i used one SP with variable table name and it works well as i pass the table name from the page , here it is :
---------------------------------------------
CREATE PROCEDURE Top1
@tblname Varchar(255)
AS
EXEC ( 'SELECT TOP 1 *
FROM ' + @tblname + '
WHERE Status="OLD"
ORDER BY ID DESC')
GO
-----------------------------------------------
The Problem now that i want to make the same thing with the INSERT STATEMENT to input new books to the table by passing the table name from the page like the SELECT one , and i `ve tried this one but gives me errors :
--------------------------------------------------------------------------------------------------
CREATE PROCEDURE AddNewStory
@tblname varchar(50),
@title varchar(50),
@Content varchar(5000) ,
@Picture varchar(200) ,
@date datetime
AS
EXEC('INSERT INTO' + @tblname + '( Sttitle , StContent, StPic, StDate )
VALUES ( '+ @Title + ',' + @Content+ ',' + @Picture+ ',' + @date + ')' )
GO
----------------------------------------------------------------------------------------------------
& th error is
Server: Msg 128, Level 15, State 1, Line 2
The name 'Dickens' is not permitted in this context. Only constants, expressions, or variables allowed here. Column names are not permitted.
Stored Procedure: db1sql.dbo.AddNewStory
Return Code = 0
SO PLEASE HELPPPPPPPPPPP
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Jun 15, 2000
Is anybody out there using SQL Expert Pro? Can you give me some feedback please?
I've been evaluating it for two weeks now and am very pleased with the results but I'm a bit hesitant to spend $5000.
Thanks!
Pete Karhatsu
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