Inheritance Advice In A Database...
Jul 20, 2005
hi folks,
i'm puzzled over this one, anyone with some solid db experience might be
able to enlighten me here.
i'm modelling a file system in a database as follows, and i can't figure out
to cleanly implement an inheritance mechanism.
i have a hierarchy of folders in an sql table. every folder has a
parentFolderID, 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 a
location in the structure. fairly basic.
the hard part is that each file record has an attribute 'STYLE' that can be
explicitly specified, or inherited from it's parent folder, or it's parents
parent 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 back
through it's parentFolderID records until i find a style attribute that is
not null.
the good thing about this is that if i change the style that is applied to
the entire filesystem, it only takes one update.
the bad thing is when i want to figure out what style applies to a file, i
have to traverse back through possibly several records to locate the folder
that 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 it
straight out first time from the db.
the bad thing is if i update the entire file system, i might have several
hundred / thousand update sql statements to execute to update all the values
in every folder and every file. nasty!
thanks for any help, i'm really stumped with this and i'm thinking there
must be a more elegant way to implement inheritance.
thanks
tim
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Nov 27, 2004
Hi is it possible to implement type inheritance in SQL server? and is it also possible to define user defined types's operators/functions in a level lower than SQL?
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Apr 11, 2008
First of all I apologise if this is a dumb question. I am from a object-orientated background and am trying to convert a legacy application to have an SQL backend. My SQL knowledge is fairly basic...
I have an application where I am trying to maintain a list of recipies that are composed of base ingredients.
No problem so far two tables Ingredients and a Recipie table coupled with another table Element which maintains the many-to-many relationship.
Ingredients
ID (PK)
Name
Cost
Recipie
ID (PK)
Name
Element
ID (PK) <-- maybe not necessary
RecipieFK <-- the recipie this element belongs to
Amount <-- the amount of the ingredient used (e.g. 200g)
IngredientFK <-- the ingredient that makes up this element
My problem comes because Recipies can also form part of other recipies, for example the White Sauce is composed of
Milk (ingrediant)
Flour (ingrediant)
Butter (ingrediant)
However a lasagne is composed of
Minced Beef (ingrediant)
Tomatoes (ingrediant)
Lasagne Pasta (ingrediant)
Onions (ingrediant)
Basil (ingrediant)
White Sauce (recipie)
In a OO environment this is simple, I have a base class Ingredient and a Recipie class derives from Ingredient. Each Recipie contains a list of Ingredients that make up the dish. As Recipie derives from Ingredient that list of ingredients can include other recipies.
The best SQL I've come up with so far is changing the Element table to be
ID (PK) <-- maybe not necessary
RecipieFK <-- the recipie this element belongs to
Amount <-- the amount of the ingredient used (e.g. 200g)
IngredientFK <-- an ingredient that makes up this element (can be NULL)
ComplexIngredientFK <-- a recipie that makes up this element (can be NULL)
And to insist that one of IngredientFK or ComplexIngredientFK must be NULL and the other cannot be. This bothers me because it doesn't feel right. There's redundancy built into this design, you'd have to use tiggers to wipe one FK if the other was specified and it is crying out for a more elegant solution, but so far I have drawn a blank.
Can anyone suggest a more appropriate schema!
Thanks in advance
Paul
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Mar 7, 2006
Hi, I am running SQL SERVER 2005 Enterprise Edition under Windows 2003 server. I would like to use table hierarchies (inheritance) in SQL 2k5 just as we do it in informix,PosgresSQL and other databases. Can we do the same in SQL 2k5 also? If yes, then how?
Thanks
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Sep 3, 2006
Is there a table inheritance in SQL ?
I need to make two tables which are identical :
1. Recharcheable battery
2. Primery Battery
Is there a way to make a 'Battery' Table and create the 1 and 2 tables with inheritance in a way that when i change a field from smallint to int in the Battery Table , The same fields in the 1 and 2 tables will be replaced too?
(I work with SQL Server 2005)
thanks.
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Aug 3, 2007
The Adventure Works Model comes with 'Sales Person' entity inheriting 'Employees'. The Binding dropdown in the inheritance property for 'Sales Person' provides a 'FK_SalesPerson_Employee_SalesPersonID' choice.
The Refining a Report Model in Model Designer Tutorial Lesson 10: Inheriting Properties from Other Entities, walks you through the process of setting this inheritance, but the Binding dropdown, after you set InheritsFrom to Employee, provides only the (None) choice. Anyone know why?
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Jul 14, 2006
Hey ,
I would like to kow how to implemented inherintance in SQL 2000.
I Have create one Employee super class and want Inherit it's attribute to subclass supervisor and Safety_officer.
Please help me
Thank tou.
Looking forward for your kind Help
Sarasahg
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Dec 12, 2007
i have two table. i want to create a veiw for display data which in both table(parent class table and a child class)
how can i do?
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Oct 12, 2007
Hi,
in my application, the data is in hierarchical format. there is a tree with set of nodes having parent child relationships. this data can be stored either through adjacency or nested set model approach. this is fine. but the issue here is that each child node inherits the properties of its parent node, parent's parent node and so on until the root node. lets say root node has two attributes A1 and A2 and they are stored in two columns in a table. but its child nodes inherits this data from its parent and it has its own extra attributes. so should I copy parent's data for the child node as two additional columns? the problem is that there are around 15 levels in the tree and the attribute list grows from top to bottom in the tree. lets say I need to find all the attributes for a leaf node in the tree (both direct and inherited), if I am not storing the inherited attributes for each node, then I need to walk-up the tree and find all the inherited attributes. there are around 30K nodes and each node has around ten attributes. xml is not option because of large volumes of data and auditing and reporting on individual nodes. what is the best way to store this type of data? my current approach is to have an attribute table having nodeid as a foreign key and only store the direct and NOT the inherited attributes of the node in the table, but this means to find all the attributes for the node, I need to gather the attributes of all the parents until the root node. I can't see any easy way out for this.
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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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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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May 16, 2007
Hi,
I have a folder structure of reports like this
Home
|
/
A B
Now, suppose I have created this folder, A first and user, say A_User is given permission to view this folder. I am expecting this user to browse from 'Home' to A folder but as you know to browse folder 'Home' he must also be added to 'Home' folder . So I add him to 'Home' now.
The problem comes when I add new folder B, for user B_User. The moment I add this folder A_User is also added to folder B because of the inheritance of users to child folders.
So user A is able to see both A and B folder....and thats my problem, he is supposed to only A folder and not B
Is there any way to disable this inheritance feature ??
I tried deleting A_User from B with a script using "InheritParentSecurity" method of ReportingService but it says that it can not delete inherited users.
How can I fix the problem ? without need to manually delete users from folders ??/
thanks
prashant
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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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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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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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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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May 23, 2006
Hi, i was after some advice on moving a SQL Server 2000 database from one server to another.
Usually i would do this by backing up the database on the original server the copying it accross the LAN to the new server and restoring it there. This database is 10Gb in size and copying it accross the LAN will take some time and i would like to minimise downtime if possible. The database is at a customer site where i am not responsible for the network or Hardware.
Thanks in advance for your help
Nick
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Sep 21, 2007
Hello
Which is better and faster?? and WHY????Writing Select Statement with joins in Stored procedure, or creating view and calling it from stored procedure (select * from view)..
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Jan 13, 2004
Hi
Dont laugh but...
I am not entirely ignorant to web technologies, and best practices but i am having a bit of a planning dylema.
My company has a well established SQL 2000 database with windows application which has been created by myself, what i am planning on doing is creating a web site, using asp.net and publishing some of the information, so that our clients may use it, and stop pestering us on the phone. what i would like to know is what would be the best way forward, obviously i don't want to show them all our information, and don't want to put 5Gb worth of data onto a ISP website. What would you suggest i do?
Thanks in advance
Brad
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Jun 8, 2004
DECLARE @returnDay int
SELECT @returnDay = DatePart(day,GetDate())
If @returnDay = 8
BEGIN
select * from Hospitals left join Units ON Units.HospitalID = Hospitals.HospitalID where Units.HospitalID is null
RETURN
END
this is just a part of the procedure I am trying to create, I am getting hospitals that haven't submitted any data and wish to send them an email.
on the other hand I have two tables that have all the data for emailing to hospitals but are not linked to tables giving the list of hospitals
I have been advised to create a cursor(easier said then done) that will go through my list of records that need to receive an email
nothing going very well with that at the moment.
so I was hoping to see if somebody has any other suggestions for me.....
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Apr 19, 2004
Hi,
I am trying to solve this procedure.
Let me try to explain it...I am getting DEGREEID from one of the SELECT query . I want to OUTPUT (ie , COUNT) from procedure,the number of departments with the degreeid, got from the above query.
With below procedure, Since an employee can have multiple DEGREEID , the cursor is giving OUPTUT ie, COUNT for the LAST Degreeid. Eventhough the previous DEGREEID dont have any DEPARTMENT...but only for the LAST DEGREEID...!
How can I solve this..... whether I can solve this with CURSOR or I have to use someother way...Please advice me !
DATA
-------
DEGREE_EARNED
---------------------
EMPID DEGREEID
------ ------------
201 12
201 3
201 250
202 3
202 10
203 17
DEPARTMENT
---------------
DEPID DEGREEID
------ ------------
10 1 12
111 250
111 12
121 3
121 12
121 250
------------------------------------
--------------------------------------------------------------------
DECLARE @vchid int
DECLARE testcursor CURSOR FOR
SELECT degree_id
FROM degree_earned WHERE emp_id= @empid
OPEN testcursor
FETCH NEXT FROM testcursor INTO @vchid
WHILE (@@FETCH_STATUS <> -1)
BEGIN
Select @outresult = COUNT(*)
from
department
where degree_id = @vchid
FETCH NEXT FROM testcursor INTO @vchid
END
--------------------------------------------------------------------
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Mar 15, 2006
I tried to run a SQL script and i get the following message
quote:Error Message = Native SQL Error Code
[Microsoft][ODBC SQL Server Driver][SQL Server]Line 1: Incorrect syntax near ''.
SELECT name, id, description FROM products WHERE id=4INSERT INTO ''admin_login'' (''login_id'', ''login_name'', ''password'', ''details'') VALUES (252,''neo2'',''newpas5'',''NA'')--
Error Code : 350
F:InetpubParexeldefault.ihtml
iSQL dbname="Parexel" ALIAS="prod" SQL="SELECT name, id, description FROM products WHERE id=4INSERT INTO 'admin_login' ('login_id', 'login_name', 'password', 'details') VALUES (252,'neo2','newpas5','NA')--"
[Microsoft][ODBC SQL Server Driver][SQL Server]Line 1: Incorrect syntax near ''.SELECT name, id, description FROM products WHERE id=4INSERT INTO ''admin_login'' (''login_id'', ''login_name'', ''password'', ''details'') VALUES (252,''neo2'',''newpas5'',''NA'')--
Im new to SQL and i dont know what im doing
Also what does this mean
quote:iSQL dbname="admin" ALIAS="prod" SQL="SELECT name, id, description
What do SQL databases do and what would i need to do to enter data in to SQL such as a email address or cant that be done?
I think dbname is the database name ALIAS is that the table name?
im just trying to enter data in to my database database and i have no clue what im doing.
Iv read guides online but i get the above error 350
D
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Jul 18, 2006
Hi all,
My first request for help here even if I read this site quite often and got tons of usueful information. Thanx all
I have an application (VB 6) calling store procedure on a SQLServer 2000 DB. One of the table gives me headache. I wrote a simple store procedure to insert a record into that table. If I call the store procedure from query manager it works perfect but if I call it from VB it looks like to work (return from the execute fine) but then I query the table for that record and it'll just take time and then return time out. I have to stop the VB application and then query it again then it'll return no record.
I suspect the table being locked somehow but I check inside the VB app code and that's the only place the table is called. Further more I have hundred of store procedures being used that way and they're all ok. I indexed the table , no use either...
I am just short of ideas how to debug this...I'll need your advice :)
thank you
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Feb 6, 2006
Okay, given my newness to SQL, and the complexity of this query, I thought I'drun this by you for your opinion:SELECT DISTINCT a.WeekEnding, c.lastdate, c.numlate, b.totaldateFROM Accomplishment a LEFT OUTER JOIN(SELECT weekending, COUNT(weekending) AStotaldateFROM AccomplishmentWHERE (EmployeeID = 50)GROUP BY weekending) b ON a.WeekEnding =b.weekending LEFT OUTER JOIN(SELECT weekending, MAX(entrydate) ASlastdate, COUNT(weekending) AS numlateFROM accomplishmentWHERE employeeid = 50 AND entrydate >weekendingGROUP BY weekending) c ON a.WeekEnding =c.weekendingORDER BY a.WeekEndingWhat I'm trying to do is for each pay period find which ones the employeesubmitted a timesheet and which they were late (and if they were late, howmany of them). However, the query takes a good 5 seconds, and it seemsremoving the "entrydate > weekending" clause speeds things up to almostinstant, however it does ruin the count that I really want. No idea whythat makes such a difference..
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