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Use Variable as SQL column Name in query


Use Variable as SQL column Name in query

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sql_learner29
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Hi all,

Is it poosible to use a variable as a column name in SQL?

EXAMPLE:

DECLARE @ColumnName VARCHAR(100)

set @ColumnName= 'Date Received '+ GETDATE()



SELECT Datecolumn as @ColumnName
FROM TABLE1



Quiet obviously I am getting an error here...
I found a way to do it but that by keeping the select query in a diffrent variable like this:
SET @SQLQUERY = N'SELECT DISTINCT (' + QUOTENAME(@COLUMNNAME) + ') FROM TABLE1'


but It doesn't satisfy my need, as I wanna use it in my select query directly...
I'm not sure if its possible but my googling so far ........

thanks for ur help


---------------------------------------------------

Thanks

Steve Cullen
Steve Cullen
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I'm not really sure what your requirement is. You will need to use some form of dynamic sql.


declare @ColumnName varchar(50)
declare @sql nvarchar(max)

set @ColumnName = 'SalesData_' + convert(varchar(2),datepart(dd,getdate()))
set @sql = 'select ' + @ColumnName + ' from SalesTable'
print @sql

EXEC sp_sqlexec @sql



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chaitukadivella
chaitukadivella
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This works fine when the table is in default schema that is dbo. Can you specify how we can make this query work when the table is in some other schema.
Lynn Pettis
Lynn Pettis
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chaitukadivella (8/7/2012)
This works fine when the table is in default schema that is dbo. Can you specify how we can make this query work when the table is in some other schema.


Is the other schema known and static or can it change as well?

Cool
Lynn Pettis

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Lynn Pettis
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chaitukadivella (8/7/2012)
This works fine when the table is in default schema that is dbo. Can you specify how we can make this query work when the table is in some other schema.


The simple answer is this:



declare @ColumnName varchar(50)
declare @sql nvarchar(max)

set @ColumnName = 'SalesData_' + convert(varchar(2),datepart(dd,getdate()))
set @sql = 'select ' + @ColumnName + ' from yourschema.SalesTable'
print @sql




Cool
Lynn Pettis

For better assistance in answering your questions, click here
For tips to get better help with Performance Problems, click here
For Running Totals and its variations, click here or when working with partitioned tables
For more about Tally Tables, click here
For more about Cross Tabs and Pivots, click here and here
Managing Transaction Logs

SQL Musings from the Desert Fountain Valley SQL (My Mirror Blog)
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