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Group by... little problem

Author

Topic

mirko_fal
Starting Member

2 Posts

Posted - 2011-11-29 : 04:59:22

Hi,
I have a little problem with GROUP BY.
I have this table:

id code
A 1
A 3
B 1
B 2
C 2
C 3

I would like see only the "aggregation" that have code=3 at least once.
If I use GROUP BY (id) I have 3 rows (A, B and C)
But what can I do to see only the rows A and C (which have code=3)?

Thank you very much

khtan
In (Som, Ni, Yak)

17689 Posts

Posted - 2011-11-29 : 05:02:07

[code]
select t.id, sum(t.code)
from this_table t
where exists
(
select *
from this_table x
where x.id = t.id
and x.code = 3
)
group by t.id
[/code]

KH
[spoiler]Time is always against us[/spoiler]