Am Montag, den 25.07.2005, 18:11 -0300 schrieb Marc G. Fournier:
> Just curious as to whether or not a warning or something should be issued
> in a case like:
>
> SELECT c.*
> FROM company c, company_summary cs
> WHERE c.id = cs.id
> AND cs.detail = 'test'
> ORDER BY cs.fullname;
>
> Unless I'm missing something, the ORDER BY clause has no effect, but an
> EXPLAIN shows it does take extra time, obviously ...
It just does the sorting as you requested. Check the order of
the resulting c.id.
See:
experiment=# SELECT * FROM A;
a_id | a_value
------+---------
1 | abc
2 | bcd
3 | def
(3 rows)
experiment=# SELECT * FROM B;
b_id | b_value
------+---------
1 | xyz
2 | ijk
3 | abc
(3 rows)
experiment=# SELECT a.* FROM a,b WHERE a.a_id=b.b_id ORDER BY b_value;
a_id | a_value
------+---------
3 | def
2 | bcd
1 | abc
(3 rows)
So no reason for warnings :-)
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