Hi!
My problem is when I use group by concat(col1,col2) when col1 and col2
is primary keys and col1 is varchar(255):
SELECT col1,col2 FROM Table1 GROUP BY concat(col1,col2);
-> return only one row - it is bad
SELECT col1,col2 FROM Table1 GROUP BY concat(col1,col1,col2);
-> return 48 rows - it is ok, but concat(col1,col1,col2) is stupid
I change col1 to varchar(155):
SELECT col1,col2 FROM Table1 GROUP BY concat(col1,col2);
-> return 48 rows - it is ok
My platform: Linux x86, MySQL 3.23.39, table is myisam format.
Is it bug or feature?
Thanks
Marek
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