Comments on: MySQL Standard Group By

By: Suhani

Suhani — Tue, 31 Aug 2010 10:33:28 +0000

ok ..thanks for the reply

By: maclochlainn

maclochlainn — Tue, 31 Aug 2010 06:54:53 +0000

MySQL 5.1 doesn't support the GROUPING command. I believe only Oracle and Microsoft SQL Server support the GROUPING command. You'll have to just use the UNION ALL set operators.

By: Suhani

Suhani — Tue, 31 Aug 2010 05:05:47 +0000

hi… nice article..

have one question. is there any functionality in MySql which results same as grouping sets of oracle ?

By: maclochlainn

maclochlainn — Sat, 13 Mar 2010 22:15:46 +0000

Gary,

While there’s no TO_CHAR in MySQL, you’re intuition served us well. There’s a huge downside to overriding the default behavior. Hidden columns means grouping by function results. Thanks for getting me to dig deeper.

Michael

By: gary

gary — Wed, 10 Mar 2010 23:09:29 +0000

Don’t have a MySQL available, but I’d be interested to know whether blocking the standard behaviour has other consequences.
Particularly, I’m thinking about where you might do the equivalent of
SELECT TO_CHAR(date_col,’DD/Mon/YYYY’) dte, count(*)
FROM table
GROUP BY date_col
ORDER BY date_col

So you are not explicitly grouping by the expression in the select list, but the selected expression can be directly and deterministically derived from the column in the group clause.

Another example might be
SELECT ‘Color ‘||color||’:'||count(*)
FROM table
GROUP BY color