I have a column that looks something like this:
CASE WHEN col1 > col2 THEN SUM(col3*col4) ELSE 0 END AS some_product And I would like to put it in my GROUP BY clause, but this seems to cause problems because there is an aggregate function in column. Is there a way to GROUP BY a column alias such as some_product in this case, or do I need to put this in a subquery and group on that?
4 Answers
My guess is that you don't really want to GROUP BY some_product.
The answer to: "Is there a way to GROUP BY a column alias such as some_product in this case, or do I need to put this in a subquery and group on that?" is: You can not GROUP BY a column alias.
The SELECT clause, where column aliases are assigned, is not processed until after the GROUP BY clause. An inline view or common table expression (CTE) could be used to make the results available for grouping.
Inline view:
select ... from (select ... , CASE WHEN col1 > col2 THEN SUM(col3*col4) ELSE 0 END AS some_product from ... group by col1, col2 ... ) T group by some_product ... CTE:
with T as (select ... , CASE WHEN col1 > col2 THEN SUM(col3*col4) ELSE 0 END AS some_product from ... group by col1, col2 ... ) select ... from T group by some_product ... While Shannon's answer is technically correct, it looks like overkill.
The simple solution is that you need to put your summation outside of the case statement. This should do the trick:
sum(CASE WHEN col1 > col2 THEN col3*col4 ELSE 0 END) AS some_product Basically, your old code tells SQL to execute the sum(X*Y) for each line individually (leaving each line with its own answer that can't be grouped).
The code line I have written takes the sum product, which is what you want.
3I think the answer is pretty simple (unless I'm missing something?)
SELECT CASE WHEN col1 > col2 THEN SUM(col3*col4) ELSE 0 END AS some_product FROM some_table GROUP BY CASE WHEN col1 > col2 THEN SUM(col3*col4) ELSE 0 END You can put the CASE STATEMENT in the GROUP BY verbatim (minus the alias column name)
If you are grouping by some other value, then instead of what you have,
write it as
Sum(CASE WHEN col1 > col2 THEN SUM(col3*col4) ELSE 0 END) as SumSomeProduct If, otoh, you want to group By the internal expression, (col3*col4) then
write the group By to match the expression w/o the SUM...
Select Sum(Case When col1 > col2 Then col3*col4 Else 0 End) as SumSomeProduct From ... Group By Case When col1 > col2 Then col3*col4 Else 0 End Finally, if you want to group By the actual aggregate
Select SumSomeProduct, Count(*), <other aggregate functions> From (Select <other columns you are grouping By>, Sum(Case When col1 > col2 Then col3*col4 Else 0 End) as SumSomeProduct From Table Group By <Other Columns> ) As Z Group by SumSomeProduct 
