- You can use an aliased column in the GROUP BY clause, but not in the WHERE clause:
SELECT func(foo) as alias FROM baz GROUP BY alias
works, but
SELECT func(foo) as alias FROM baz WHERE alias='quux' (*)
doesn't. You have to write
SELECT func(foo) as alias FROM baz WHERE func(foo)='quux'
- Modifying a column: which phrase will do what I want?
ALTER COLUMN, CHANGE COLUMN, or MODIFY COLUMN? I can never remember and have to look them up.
yeah, mysql is annoying ...
duff on 2007-03-30T04:13:54
I believe your example
can be written thusly though:
SELECT func(foo) as alias FROM baz HAVING alias='quux'
Re:yeah, mysql is annoying ...
fansipans on 2007-03-30T12:30:47
Which is still horrible because HAVING operates after a GROUP BY operation ... in fact I wonder if HAVING without a GROUP BY would give errors with other databases (SQLite 2.8.17 gives an error for example)
