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How do I retrieve database results from one field across multiple rows as strings so that I can use them in a second SQL Query?

Posted on 2006-07-19
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Last Modified: 2010-04-23
Hi

I have a need for some code to retrieve results from one field across multiple rows as strings so that I can use them in a second SQL Query. I am using VB.net2003 to create a Winforms application with a SQL 2000 Database Server in the backend. For example the sample code I am looking for will allow me to do something like the following;

SQLCommand1 = SELECT ProjectID FROM Table_Projects WHERE StaffID= @StaffID

RESULTS (Expected Between 0 and ? rows)
Table_Projects.ProjectID = @ProjectID_Row1
Table_Projects.ProjectID = @ProjectID_Row2
Table_Projects.ProjectID = @ProjectID_Row3

Table_Projects.RowCount = 3

Magic happens somewhere here or above????

SQLCommand2 = SELECT * FROM TableDocments WHERE (DocumentID = @ProjectID_Row1) AND (DocumentID = @ProjectID_Row2) AND (DocumentID = @ProjectID_Row3)

I assume doing this in code is the way to go, if it is better to do all this on the Server in some sort of multi-step SQL Stored Procedure please let me know.

Thanks in Advance

Matthew
 



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Question by:mj_stanton
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Accepted Solution

by:
Nandakumar Sakthivel earned 500 total points
ID: 17143839

 If i haven't misunderstood your question
 why don't you use like this directly in the query

           SELECT * FROM TableDocments WHERE DocumentID in (select  SELECT ProjectID FROM Table_Projects WHERE StaffID= @StaffID)

Thanks,
Nanda

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Author Comment

by:mj_stanton
ID: 17143883

Wow, I may be showing my SQL inexperience here I have not seen a Query within a Query before but I will give it a go by testing it on the SQL server.

I made one typo in my question  "SQLCommand2" which would change you suggested solution to be as follows.

SELECT * FROM TableDocments WHERE TableDocments.ProjectID in (select  SELECT ProjectID FROM Table_Projects WHERE StaffID= @StaffID)

I will get back to you soon

Matthew
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Author Comment

by:mj_stanton
ID: 17143937
Excellect Worked very well,
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Author Comment

by:mj_stanton
ID: 17143948
Sorry for the benifit of others I should say that I had to remove the Second "Select" Statement so the solution looked like this.

SELECT * FROM TableDocments WHERE TableDocments.ProjectID in (SELECT ProjectID FROM Table_Projects WHERE StaffID= @StaffID)
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