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SQL Reporting - Dynamic Column Names Based on Report Values

Posted on 2012-04-11
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Last Modified: 2012-05-21
I have a report that uses several CTEs, each CTE return several values.  One of the values returned from each CTE is actually one that I need to use as a column name in the final report.  Please can you advise if there is a way assign the value to the column name e.g.

CTE1.Value AS CTE1.ColValue

Obviously wont work but in effect what I am trying to achieve.

Thanks
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Question by:Damozz
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Accepted Solution

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Ryan McCauley earned 2000 total points
ID: 37836072
Are you trying to do this in SSRS, or just name the column in the query results?

If it's SSRS, you should be able to just drop the value onto the report in the header instead of specifying the column name manually, and it should use the first value.

If you're trying to do it in SQL query, you'll need to use dynamic sql to do this, and I'd consider it dangerous, since you'll be injecting the contents of a column into the sql query itself, and a malformed value could have undesired (or damaging) effects, ala Bobby Tables. That said, you'd accomplish it like this:

DECLARE @ColumnName NVARCHAR(100),
        @SQL NVARCHAR(4000)

-- Get your results
SELECT Column1, Column2, Column3, Column4
  INTO #Results
  FROM SomeTableOrSetOfTables

-- Set your column name to the first row of whatever column
SELECT TOP 1 @ColumnName = Column4
  FROM #Results

-- return the results with a re-headered column
SET @SQL = 'SELECT Column1, Column2, Column3, Column4 AS ''' + @ColumnName + ''' FROM #Results'
exec sp_executeSQL @SQL

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Is that what you're looking to do?
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Author Comment

by:Damozz
ID: 37836282
I'll porvide a little more detail, I have a report that runs over a 12 month period and the months run April to March, but I need to append the relevant year to the month.  Due to the financial year spanning two calendar years I was looking to use the results to determine the year.
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Expert Comment

by:Ryan McCauley
ID: 37836289
You're still using the term "report" a little unclearly - do you mean just a SQL query, or is the data fed into an SSRS or Crystal report for display? Where do you want to make the correction - in the source query or on the displayed report?

Will my solution work for changing your column name in the source?
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Author Comment

by:Damozz
ID: 37992457
I've requested that this question be deleted for the following reason:

This is no longer a requirement.
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LVL 28

Expert Comment

by:Ryan McCauley
ID: 37992458
I believe the solution will work for the problem as stated - though it's "no longer a requirement", has the OP had a chance to test it? I posted it almost a month ago.
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