Help Me Choose Between Two Designs
May 14, 2008
I'm currently developing an ASP.NET website which is using SQL Server 2005 and I couldn't decide between two table designs and I hope you can give me your opinions
The website is for a school and it'll be used to create tests from questions. The teacher will:
1. Select grade (could be multiple selection)
2. Select class
3. Select subject
The thing is that same question could be used for multiple grades.
Example query: "Get me questions of trigonometry of math from grades 7,8,9"
(Names used instead of ID's to make it more clear)
The first design:
[BigRelationsTable]
ID - QuestionID - GradeID - ClassID - SubjectID
1 - Question123 - Grade7 - Math - Trig
2 - Question123 - Grade8 - Math - Trig
3 - Question123 - Grade9 - Math - Trig
This is a simple design but all of the columns will need indexes because all of them will be used for searching and that makes me think about table performance.
Second design:
[GradeClassRelations]
ID - Grade - Class
1 - 7 - Math
2 - 8 - Math
3 - 9 - Math
[ClassSubjectRelations]
ID - GradeClassRelationsID - SubjectID
1 - GradeClassRelations1 - Trig
2 - GradeClassRelations2 - Trig
3 - GradeClassRelations3 - Trig
[SubjectQuestionRelations]
ID - ClassSubjectRelationsID - QuestionID
1 - ClassSubjectRelations1 - 1
2 - ClassSubjectRelations2 - 1
3 - ClassSubjectRelations3 - 1
This one is more normalised but this time the need of doing multiple joins makes me wonder.
What do you think? Which one should I use? Or if you have any other suggestions I'm all ears
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Jun 12, 2007
To the pros:,I have one question about designing tables and interface (web/windowsapplications). The requirement is like this.I want to design an application to manage upload / review / managefiles which has some meta data associated with them as well. The filescan be any documents. This application can be used in differentcompanies same way, but each company wants to use different fieldnames.So, I want to design tables generic enough to allow custom labellingfields. So if I have a tableT1 with ID, FileName, FileSize, FileAuthor.... some company may wantto use different field names. What's the best way to design tableslike this and how to maintain relationships, stored procs, triggersetc linked to these tables.Many thanks in advance,DS
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Jan 17, 2008
Hi,
is there any website or book that provide excellent database design examples to learn?
Appreciate for any help
Ricky.
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Oct 24, 2007
I have a production server log shipping to a secondary server every 30 minutes (both SQL 2000), which the second server is used for both a warm standby server and for reporting from users. Issue: the log shipping locks the DB so reporting can't be done until the load is finished, the load to the second set of databases has taken up to 15 minutes to finish allowing the users only 15 minutes to run reports, this is not acceptable. The server also needs to be used for DR.
I am looking for another solution, I can't use Transactional Log shipping as not all of the tables in the databases have a primary key identified. So, I am looking for a real-time or near real-time reporting server that is more available to running reports and a warm standby server for Disaster recovery. I am trying to figure out what SQL Server 2000 has to provide (or even 2005 or 2008?) or I am also looking at some third party software, but not sure what is the best for a reasonable price.
Any help is appreciated.
Thanks....JB
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Feb 16, 2005
Hi All,
I have a dilemn:
On one side, I have a column C1 which could be a primary key because it is never null, the value is unique and identify the record. The problem is its a char type and its lenght can be close to 30.
Then, I've planned to add another column C2 of int type as PK. But then I need to add a unique constraint index on C1. Does it improve performance anyway?
Thanks
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Jul 6, 2006
good day, everyone
if i have a transaction table with fields below :
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can some expert here point out to me , which is the best cluster-index and non-clsuter index ?
and possible kindly please explain why is it so? i'm not good in database so just explain like to beginner
thank you very much for guidance
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May 6, 2008
(Hard to put a good subject on this one...)
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Now I have to transfer the data to another database with a strict table structure and here the table that contains the user also should contain the users phone number and an alternative phone number, if the user currently has more than one phone number connected.
This means that if for instance we have three or more phone numbers connected to one user, we can maximum transfer two of them. This is not a big issue though...
We have ranked the importance of the phone numbers in the order as I presented them above.
What I do in my T-SQL query is to do a ISNULL() and see if the user has "Direct phone" connected, if not I check for the next type and so on.
Now to my problem! Can anyone give me a suggestion of how to write the code for the extraction of the Alternative phone? What I need to do is to check if there is a "Direct phone" connected to the user, if so I should NOT chose that but the next phone number that I find.
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hi guys,
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Greetings SSIS friends
I want to implement the following query using SSIS Data flow Source component :
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Any suggestions would be much appreciated.
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Mar 18, 2008
Hi there,
I have created an SSIS package which pushes data from SQL Server (2005) to Oracle (Version 9.2.0.7.0), but having some issues with setting up the connection objects to Oracle.
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I am using a 32-bit version of SQL Server 2005 and the Oracle DB is 64-bit. Any ideas?
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Jan 21, 2008
Hi there,
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Result of the sort:
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101
102
1022
103
Thanks,
LOA
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Mar 3, 2008
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below is my futile attempt
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<SelectParameters>
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I want this...:
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Obviously this won't work, but can anyone tell me what WOULD work?
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Mar 22, 2006
Hi,
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express or SQL 2005 Developers Edition for the prototype/testing phase.
Any advice? I want to build production-ready versions with easy
migrations to production, but I don't want them to have to spend too
much $$$ while it's just in alpha and being prototyped.
thanks,
Bruce
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I have a job that selects alot of data from one database into another.
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Thanks..
type of code:
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Jun 3, 2004
Hi guys!
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TABLE_2
TABLE_3
...
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Thanks in advance.
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Aug 6, 2004
Hello, everyone:
There are some explanations on this topic from books and BOL. Could you offer the real experience? Thanks.
ZYT
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Oct 28, 2004
Hi,
I have a table with its ID field set as an Identity column with "seed" and "increment" set to 1. Now, I have rows in there that I don't want to change. I'd like the next addtitions to the table to start at a specific value for their ID columns.
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Thanks,
Skip.
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Mar 17, 2007
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Dec 18, 2007
Hello all I am trying to create a stored procedure that will either give the user a chance to use the wild cards or the IR_Number, or subjLastName (from the RevisedSubjects_Table) or a begin Date and an End Date.
CREATE PROCEDURE [dbo].[AdvSrchWildCardsIR]
(@Enter_IR_Number nvarchar(100))
AS
SET @Enter_IR_Number = REPLACE(@Enter_IR_Number, '*', '%')
SELECT dbo.RevisedSubjects_Table.SubjFirstName, dbo.RevisedSubjects_Table.SubjLastName, dbo.Revised_MainTable.[Violation Type],
dbo.RevisedSubjects_Table.[IR Number], dbo.Revised_MainTable.[I/RDocument], dbo.Revised_MainTable.Date, dbo.Revised_MainTable.Action
FROM dbo.Revised_MainTable INNER JOIN
dbo.RevisedSubjects_Table ON dbo.Revised_MainTable.[IR Number] = dbo.RevisedSubjects_Table.[IR Number]
IF patindex( '*', @Enter_IR_Number) > 0
BEGIN
SET @Enter_IR_Number = replace( @Enter_IR_Number, '*', '%' )
SELECT dbo.RevisedSubjects_Table.SubjFirstName, dbo.RevisedSubjects_Table.SubjLastName, dbo.Revised_MainTable.[Violation Type],
dbo.RevisedSubjects_Table.[IR Number], dbo.Revised_MainTable.[I/RDocument], dbo.Revised_MainTable.Date, dbo.Revised_MainTable.Action
FROM dbo.Revised_MainTable INNER JOIN
dbo.RevisedSubjects_Table ON dbo.Revised_MainTable.[IR Number] = dbo.RevisedSubjects_Table.[IR Number]
END
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Sep 19, 2014
How Choose function in SQL is useful in a table. Any example with a simple table and how it can be useful for any particular column in a table
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Dec 20, 2006
Hi there
I am up against a condition where my control flow should be divided into threads and depending on value of a variable i have to choose 1 of the threads.
Its something like
if a =1 then execute this
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Thanks and Regards
Rahul Kumar, Software Enggineer
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Apr 22, 2008
Hello all,
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Thanks in advance.
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Aug 8, 2007
Hi,
I need to be able to get the maximum value of different calculations.
Example :
i have 5 calculations like this :
(sum(Fields!CountTest1.Value)/sum(Fields!TestCount.Value))*100
(sum(Fields!CountTest2.Value)/sum(Fields!TestCount.Value))*100
(sum(Fields!CountTest3.Value)/sum(Fields!TestCount.Value))*100
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what function or expression can i use to get the max value of all the calculations ?
I was looking at the "choose" function but i'm not quite sure how...
anybody ? help ....
Vinnie
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Jun 28, 2006
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I need to rewrite this for a Script Task in SQL Server 2005 but it seems like it
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Does anyone know how to write the code for choosing the next step in a
Script Task or knows another way to solve my problem?
The package is not suppose to fail if the file is missing, it's must succeed and that's why I need two success-paths.
Regards,
Sara
'**********************************************************************
' Visual Basic ActiveX Script
'************************************************************************
Function Main ()
Dim pkg
Dim stpContinuePkg
Dim stpExit
SET pkg = DTSGlobalVariables.Parent
SET stpContinuePkg = pkg.Steps("DTSStep_DTSActiveScriptTask_4")
SET stpExit = pkg.Steps("DTSStep_DTSActiveScriptTask_21")
If ...... Then
Main = DTSStepScriptResult_ExecuteTask
stpContinuePkg.DisableStep = False
stpExit.DisableStep = True
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.......
End If
Main = DTSTaskExecResult_Success
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Nov 23, 2007
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Regards,
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Jan 19, 2007
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Jul 9, 2007
I've got a page with a SQLDataSource control successfully populating a Dropdownlist...
However, now I find I need extended functionality - so I've got another page with links to this page, using querystrings - I need to hit the page, check the querystring, and if it's blank, just continue, but if the querystring is populated, then choose that item. I've tried the page_load and the page_prerender, but so far, it's not working:CC = Request.QueryString("center")If CC <> "" Then' DropDownList1.Items.FindByText(CC).Selected = TrueDropDownList1.SelectedIndex = DropDownList1.Items.IndexOf(DropDownList1.Items.FindByText(CC))End if
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ideas?
End If
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Apr 15, 2006
Hello everyone
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Apr 22, 2007
I would like to understand the algorithm that the linear regression method uses to choose the regressors in the model from a list of possible regressors.
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Jun 7, 2007
Hi there - I have a longish bit of MDX which enable some MTD reporting. I'd like to power up the report so that users can select to report by WTD, QTD, YTD by clicking hyperlinks / buttons / whatever [I'm quite new to reporting services - not quite sure what's possible.]
I could create 4 separate reports with 4 separate datasets, or one report with 4 datasets, or is there some reasonable way I can tweak the MDX for a dataset on the fly, e.g. "search and replace, find MTD replace with QTD" &c &c.
Cheers,
JG
WITH
MEMBER [MEASURES].[WT TO MTD]
AS SUM(MTD([Time].[Year - Quarter - Month - Date].CURRENTMEMBER)
,[Measures].[TURNOVER])
MEMBER [MEASURES].[WT TO MTD PrEq]
AS SUM(MTD(parallelperiod([Time].[Year - Quarter - Month - Date].[Month] ,1
,[Time].[Year - Quarter - Month - Date].CURRENTMEMBER))
,[Measures].[TURNOVER])
MEMBER [MEASURES].[WT TO MTD Vs PrEq]
AS IIF([MEASURES].[WT TO MTD PrEq]=0, null
,([MEASURES].[WT TO MTD] / [MEASURES].[WT TO MTD PrEq])-1), format='0.00%'
MEMBER [MEASURES].[WT TO MTD Rank]
AS RANK([SECTOR3].[SECTOR3 ID].CurrentMember
,[SECTOR3].[SECTOR3 ID].[SECTOR3 ID].ALLMEMBERS,
[Measures].[WT TO MTD])
MEMBER [MEASURES].[WT TO MTD PrEq Rank]
AS RANK([SECTOR3].[SECTOR3 ID].CurrentMember
,[SECTOR3].[SECTOR3 ID].[SECTOR3 ID].ALLMEMBERS,
[Measures].[WT TO MTD PrEq])
MEMBER [MEASURES].[WT TO MTD Vs PrEq Rank]
AS RANK([SECTOR3].[SECTOR3 ID].CurrentMember
,[SECTOR3].[SECTOR3 ID].[SECTOR3 ID].ALLMEMBERS,
[Measures].[WT TO MTD Vs PrEq])
SELECT NON EMPTY { [Measures].[WT TO MTD]
, [Measures].[WT TO MTD PrEq]
, [MEASURES].[WT TO MTD Vs PrEq]
, [MEASURES].[WT TO MTD Rank]
, [Measures].[WT TO MTD PrEq Rank]
, [MEASURES].[WT TO MTD Vs PrEq Rank]
} ON COLUMNS,
NON EMPTY { order([SECTOR3].[SECTOR3 ID].[SECTOR3 ID].ALLMEMBERS,[MEASURES].[WT TO MTD Vs PrEq], bdesc) } ON ROWS
FROM [WmCube4]
where [TIME].[Date].&[2007-06-04T00:00:00]
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Aug 9, 2007
I have 100k + records in table usr_table and I want to select all of them that do not have the same ID as the ID's indicated in table Usr_Type_Data
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I get 0 returned.
If I change it to:
Select * From usr_table As t1 Join Company_Sales.dbo.Usr_Type_Data As t2 ON t2.user_id = t1.user_id Where CustomerTypeId = 7
I get all records from table Usr_Data_Type returned.
Do I need to specify a special Join type?
Or perhaps change the T-SQL around?
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