On , Frank Lanitz wrote:
Am 23.08.2012 09:52, schrieb Condor:
Hello ppl,
I try to make query and see how many ids have more then one row.
few records is:
ids | val | some
a | 1 | x
a | 1 | v
b | 1 | x
b | 2 | c
I focus on ids and val with:
SELECT ids, val FROM table WHERE ids = 'a' GROUP BY ids, val HAVING
COUNT(ids) > 1;
and result is:
ids | val
a | 1
Well in this condition pgsql shold not return me positive result
because
on documentation I read having count work on group clause,
and when I group these two records based on ids = 'a' they become to
one
row and my condition is if the result after grouping is greeter then
1.
I use postgresql 9.1.4 x64
Any one can tell me what I miss ?
Not sure I understand you correct, but maybe count() is working for
you.
Maybe you would need some primary key for good values.
cheers,
Frank
Sorry for my email,
after some thinking I understand my error and change query to:
SELECT COUNT(DISTINCT val), ids FROM table WHERE ids = 'a' GROUP BY ids
HAVING COUNT(DISTINCT val) > 1;
and it's work.
Thanks.
Hristo C.
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