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?
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.
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?
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?
join dbo.datusersall da on du.UserObjectID=da.UserObjectID
I'm getting the error:
Msg 4104, Level 16, State 1, Line 1
The multi-part identifier "ua.passwordsha1" could not be bound.
I dont know what it means. I'm trying to update the password column from 'da' table. both tables have same records. and UserObjectID is the identity pk.
Hello everyone,I have a webcontrol that uses database-structures alot, it uses the system tables in SQL to read column information from tables. To ease the load of the SQL server I have a property that stores this information in a cache and everything works fine.I am doing some research to find if there are anyway to get information from the SQL server that the structure from a table has changed.I want to know if a column or table has changed any values, like datatype, name, properties, etc.Any suggestions out there ?!
Hi, I have a complicated sql server mobile database (.sdf) and need to create a SQL SERVER database with the same tables. How can I do it without scripting the whole thing? I thought of using the views.information_schema databases, but it is still a lot of coding.
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
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
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
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 )
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?
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
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.
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 )
Hello I am a final year student and for my final year project I have decided to try and create a price comparison website due to the fact that i feel it would be a good project to work on and develop my technical skills in C# and microsoft sql server 2005, since these are mainly the two programs I would say i have more experience with. Basically I want to create a website such as www.pricerunner.com. At this point in time i have started playing around with how i feel the database will look, in terms of tables and columns, below is what i have produced; Company Company_ID Company_name ADDRESS Website link contact Products Product_ID Product_name Product_Category Product_Price
I am now stuck as how i will link each company with a product bearing in mind a company will stock different categories of products, also do you think i need any more columns in any of the above tables, as well as am i missing out on anything, I am hoping someone with more knowlegde than myself can shed some knowledge on my problem, thank you.
I'm sure there is a simple way to do this but I cannot think of it.I have an ASP.NET application that I am publishing to a webhost. I have chosen to use FTP to copy my files (aspx, etc.). They work as far as links etc. Now, the next step is to create my SQL database on their server as they instruct, which I have done in name only. (Oh, if it makes a difference, I access the hosting service using Plesk control panel.) Is there any simple way to get my database structure from my PC to the host server? All responses welcome. Thanks.
Hi All, I need to get some info on how I can get the script of the entire database stucture. I need to write a procedure to do this. I know in SQL Server I could get the script in a mouse click. But I need to write a procedure to do the task. Is there a package in SQL Server that I could use to accomplish this task? Any thoughts will be of help. Thanks in advance. sj
I am very new to SQL server, and am completely stumped here. I need to transfer the data from an old database to a new one (both SQL Server 6.5 DBs.) The only problem is that the database has been restructured, and I can't for the life of me figure out how to get the data imported. I am working on manually making all of the structure changes, but there must be a better way. Any ideas? Thank you SO much!
This is a sort of database structure question that could I guess apply to any type of database...
Say I have 4 production lines and I want to log serial numbers on the start of every line and off the end of every line.
Is there any advantage in having a separate table for each Production Line and serial number logging point? (i.e. t_Line1Start, t_Line1End, t_Line2Start etc) or is it just the same as having one big table and having a LineNumber field and a StartEnd field?
Is SQL Server just as happy dealing with fewer transactions to several tables as it is to many transactions to one table?
Is there a way I can copy my SQL 2000 database including procedures, views tec. the whole works but not the data in any table.
I want to share with a relative a copy of my application (web based) he has his own SQL 2000 server but I do not want to give my data just the database so the application will run and he can start inputting his own data.
How can I do this like a backup which has everything but with no data.
I tried scripting it using the EM but it did not give me everything just the system db's
I'm designing a web application that acts as business management software for many small autobody shops. This method was chosen because it creates a central point of administration for the software and I believe that a properly configured cluster of services will meet performance requirements. Using SQL Server 2k5 as my backend, I need to structure my DB(s) so that performance and size are kept to a minimum.
That being said, the first problem I encounter is in creating a structure that supports multiple businesses, each with their own unique dataset.
For example, each business will have work orders specific to their business. This necessitates a uniqueness constrained by businessID (hereafter titled "BizID") and WorkOrderID (WoID). The first solution I happened on was the simplest: A composite primary key composed of BizID (int) and WoID (int). The unfortunate consequence of this, as I soon realized, was that *every* table containing multiple business' data would need this composite key structure. The second problem with this method is that there is no such thing (to my knowledge) as a composite identity. I could identify WoID as the identity column, but it would not iterate WoID for BizID x properly if any other Biz added a work order to the table. (i.e. biz 1 adds three work orders (identitied 1, 2, 3), biz 2 adds one work order (would identity as 4) and Biz 1 adds another (would identity as 5), leaving us with 1, 2, 3, 4, 5 across two businesses, rather than 1, 2, 3, 4 for biz 1 and 1 for Biz 2)
The second idea I considered was one DB per business. I didn't consider that for very long, since I assumed size considerations would be blown out of the water if I had 50 business and 50 DBs. I could be wrong, as I am decidedly a novice at this. It does benefit from not putting all my eggs in one basket though and makes backup/recovery/troubleshooting much simpler.
The third idea I considered was one table per business. This suffers from the same issues as #2 above with not as many of the benefits.
Both ideas 2 and 3 would need a master table relating logins to the DBs they belong to, which would not be hard to implement at all, but the implications of using this method are unknown to me.
So quite obviously, I'm a novice at this. Perhaps I took a project on that was too big for my britches, but just getting out of college puts me in a good place to take a risk and I will learn a great deal from putting a complex (is it so?) system like this into action.
I appreciate any and all responses, thanks in advance for your replies!
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
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
I have one databaseand I create new database by copy everything from first db I then alter some column on new database and now I would like to compare two databaseHow can I do it ?
Hey, I havent been working with databases for quite a while but now im in charge of creating a rather powerful website with webzine (online magazine) among other things. Within this magazine there are several different categories of articles such as concerts, album reviews, interviews, product reviews etc etc which obviously recquire rather differently structured tables. Multiple images are going to be uploaded to all articles and users are going to be able to comment on all the articles. Since the comments and image tables dont differ between the articles i would much rather store all comments for example in the same table, but wont i get relationship problems? Perhaps I could have a column referring to a certain kind of article, and then a second column with the id of that specific article? Or is the best way simply to have a seperate image and comment table for each set of articles?
Hi i have a student table and also an societies table, and a student can belong to as many societies as possible, for example student John Taylor belongs to the Football society, rugby societey and dance society, where as student Jim Jenkins belongs to the Football society, rugby society, arts society and graphics society. My tables so far look like this; STUDENTS; student_id, student_name SOCIETIES; society_id, society_name
My question is how can i make the scenario above reflect in my table structure, would i need to create another table, if so what fields or columns should i place in this new table, thank you.
Hello all! I'm working on an application that requires a bit of tricky database development, and I was hoping to get some advice from you. The best way to describe the application, is to use an example, and the best I can think of is Facebooks news feed, where you can see if any of your friends have become friends with other members, or joined any groups, if your friends have completed quizs, attended any meetups, got arrested at the weekend etc etc.. My application is similar, but requires a lot less features. It will only tell show you if any of your friends have become friends with other members, or joined any groups (example: your friend Dave is friends with Jane). Currently in my database, I have... users table (that holds a list of registered users) friends table (that links users who have decided to become friends with other users)groups table (that holds different groups)user_joined_groups table (that links users to groups they have decided to join). Its simple and it works fine. So to get around the newsfeed problem, I thought of doing this, creating 2 new tables. The first table will hold the news type and give it an ID... NewsTypeTable============NewsTypeID NewsType1 NewFriend2 JoinedGroup The next table will be FriendsNewsTable, and everytime a user joins a group, or makes a friend with another user, details are added in here... FriendsNewsTable=============NewsID NewsTypeID FriendID newFriendID newGroupID datecreated1 1 225 156 2 2 95 52 Ok, so above in the FriendsNewsTable, the first record shows that the user has made friends with someone, and the second record shows that a user has joined a group. I though that this approach might work. but then I though... If I have 20 friends, that means I am going to have to search with each one through FriendsNewsTable, which could contain 30,000 records (wishful thinking!) So this is bound to make the page crawl to say the least. So does anyone have any advice how I should go about this? Thanks! Matty
What method would you suggest is the best way to deal with a website?
Say for example, writing SQL. Am I better using Stored Procedures and adding methods for accessing there or just writing the SQL inline. What do you think about this? Is it totally overkill to use stored procedures in a small website?
I'm trying to design a site for parent conference scheduling. Usually we have a couple of days appointment time, for example 5/8/2008, and 5/9/2008. and the time usally start at 7:00 and ends at 9:00. one appointment time lasts about 20 minutes. I would put a page something like this, after parent or student login, 1. they are asked to choose a date, 2.after the date is chosen, show available teacher names, 3, after the teachers are selected, for each teacher, it will show a list of radio buttons for parents to select the time period open, For example: teacher: John smith. time: 7:00; radio button 7:20 radio button 7:40 Booked............... 8:40 radio button 4, the student choose the available time, and then enter student name, then submit. I would like to know how to setup the database table and present to the users. Currently for this scheduling part I have tables like teachertable, scheduling table, Appointment table. Teacher table: teacherID, name, email, course,Scheduling table: appointD, TeacherID, room, appt date I think I will prepopulate the two tabels before conference time. and after user submit the selection, insert into Appointment table the other fields like scheduling ID, appoint time, and studentname. The things confuse me, is how can I deal with the appointment time fields, shall I add another table for appt time? should this field be prepopulatd to the table and pull from the table for student to select or something else? HOw can I do with this: if a teacher not available after 8, how can I excluded the time period for the teacher? Thanks
Hello,I am upgrading my (simple) cms from one menu layer to two layers. So i have two tables in de my DB- table_mainmenu- table_submenuThe submenu records are linked to the mainmenu records on the mainmenu id. So far so good. Heres my problem, i cant figure out how to change the order of the pages...!? What is the theory behind recording the stacking order of the menu items? How can i record this information in the DB?I just need the theory, i can figure out the details for myself. Thanks in advance!Corstiaanp.s. is the the right forum to post this?
I have a friend who is a contract developer working remotely for a company on a SQL Server + VB project. He is having difficulty because someone at the company is making changes to the database tables without informing him, and of course then there are numerous application errors. This has happened far too many times for him to dismiss it. Examples of these changes are changing field names, deleting fields, changing datatypes, even changing the server name. My question is does SQL Server automatically log changes to the database, and if so, how can this log be read?
