Using a variable for a column name within a query and assign result to another variable...

• scott-1009141

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  Points: 51

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  December 18, 2009 at 12:51 pm

  #385976

  Essentially, I have a stored procedure that contains a cursor which iterates through records within a table that contains table names and column names where to find a certain value that I want to assign to a variable.

  So, in Table1, I have the columns ItemName, TableName, and ColumnName.

  I want to read the values from those three columns into three variables via a cursor. I then want to build a dynamic statement to query the table and column from @TableName and @ColumName and assign the value in that column of that table to a seperate variable.

  Or maybe this makes more sense:

  DECLARE @cn varchar(50)

  DECLARE @value char(1)

  SET @cn = 'MyColumnName'

  EXEC('SELECT TOP 1 @value = ' + @cn + ' FROM TableName')

  I want to have @value = the value of whatever column is specified in the column with the name of @cn in the table called TableName.

  Any ideas?

• Ray K

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  December 18, 2009 at 1:21 pm

  #1094293

  I think I have the gist of what you're asking. Can you supply some specific examples?

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• Ray K

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  December 18, 2009 at 2:16 pm

  #1094325

  Actually, now that I'm re-reading it . . .

  Why are you building a dynamic query? Why not do this:

  DECLARE @cn varchar(50)

  DECLARE @value char(1)

  SET @cn = 'MyColumnName'

  SELECT TOP 1 @value = @cn FROM TableName

  SELECT @value

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