Question : Case statement in SQL 2000 with variables

I would like to switch a column name in a where clause depending on the value of one of the parameters in the stroed proc.

I know I could convert my statement to a string and then exec(@string), but since I have already written the statement and this issue came up now, I wanted to avoid rewriting the whole query as a string.

@Processed, @BeginDate and @EndDate are parameters of the stored proc. Thanks for any help.
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if @Processed = 1
	begin
		set @ColumnDateType = 'dbo.table1.DateProcessed'
	end
else
	begin
		set @ColumnDateType = 'dbo.table1.EligibilityDate'
	end
 
 
SELECT  col1,col2         
FROM         table1
where  
	@ColumnDateType between @BeginDate and @EndDate
 
The where clause gives a conversion error when I have the @ColumnDateType variable in it.
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Answer : Case statement in SQL 2000 with variables

You have to use Dynamic SQL to achieve this
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SET @sql nvarchar(4000);
if @Processed = 1
        begin
                set @ColumnDateType = 'dbo.table1.DateProcessed'
        end
else
        begin
                set @ColumnDateType = 'dbo.table1.EligibilityDate'
        end
 
SET @sql = 'SELECT  col1,col2 FROM table1 where ' + @ColumnDateType + ' BETWEEN @BeginDate AND @EndDate';
EXEC sp_executesql @sql;
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