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Message Posted: Thu, 29 Jul 2004 @ 13:09:57 GMT
<-- Anonymously Posted: Thursday, July 29, 2004 09:08 -->
I was wondering, does anyone know if it is possible to treat a parameter in a Macro as an 'object'? I don't think it is possible, but thought to check here first. Please see the example below.
I'm trying to get a distinct list of values for a column, based on the column name passed to the Macro. The table I'm selecting from is subject to change often (add columns/remove columns), therefore the current CASE approach shown below is not viable. The number of columns in the table on average is 45. The table contains a few million rows.
Unfortunately my solution has to be a macro. I'm trying not to use Dynamic SQL in a Stored Procedure, since that may involve multiple steps, which isn't something that would work for my scenario.
REPLACE MACRO MyMacro (colname char(30)) AS ( SELECT CASE WHEN :colname = 'CHECK_ID' THEN CHECK_ID WHEN :colname = 'BIRTH_DATE' THEN BIRTH_DATE WHEN :colname = 'OPEN_DATE' THEN OPEN_DATE etc.. END FROM mydb.mytable GROUP BY 1;) ;
Need to do something like this, but it doesn't work.
REPLACE MACRO MyMacro (colname char(30)) AS ( SELECT ":colname" FROM mydb.mytable GROUP BY 1;);
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