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Variable column names

Posted on 2002-05-24
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Last Modified: 2008-01-16
Is it possible to use a variable column name?  I realize that you can call execute to execute the command, but execute does not return a resultset, so it becomes a little bit hairier than I would have liked it to be.  I'm using SQL Server 7.
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Question by:nixj14
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by:Anthony Perkins
ID: 7033183
<<but execute does not return a resultset>>
I think you will find it can.

Anthony
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by:Scott Pletcher
ID: 7033194
AFAIK the only way to vary what a column name will be/what columns appear in a query is to use dynamic SQL as you mentioned, either:

EXEC(sql)

or

EXEC sp_executesql @sql

where @sql has been constructed to contain the column(s) you want.
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by:nixj14
ID: 7033217
acperkins, how does it return a resultset?  I'm not seeing documentation for this
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by:Anthony Perkins
ID: 7033245
Just as Scott has pointed out:

Exec('Select * from Customers')

Will give you a resultset.

Anthony
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by:nixj14
ID: 7033276
That returns the resultset to a screen, but it doesn't make a resultset usable in SQL.  For instance:

say I had a the following query:

select * from customers
where cg_id in (put execute statement here)

it doesn't work when I tried it
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Anthony Perkins earned 50 total points
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True.  But you could do this using the NorthWind database:

Exec('Select * From Orders Where CustomerID In (Select CustomerID From Customers Where Country=''USA'')')

Anthony
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by:Anthony Perkins
ID: 7033408
The use of the NorthWind database was just as an example as I am unfamiliar with your data structure. Using this database makes it simple for you to check yourself.

Anthony
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by:Anthony Perkins
ID: 7047076
Uh, thanks.

Anthony
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