Hello,
As the error indicates, you must give an alias for subquery
select a,count(1) FROM (select a from X UNION select a from Y ) as
your_alias_name group by a;
----- Original Message -----
From: "A B" <gentosaker@gmail.com>
To: <pgsql-novice@postgresql.org>
Sent: Friday, July 17, 2009 01:53 PM
Subject: [NOVICE] need some more select help
> I'm trying to
>
> select a,count(1) FROM (select a from X UNION select a from Y ) group by
> a;
>
> but it complains and says that the subquery must have an alias and I
> have not figured it out how to add that.
>
> Btw. is there any other way of doing what I'm doing above?
>
> It's basically select a,count(1) from X group by a + select
> a,count(1) from Y group by a where "+" means they should be summed
> on the "a" field.
>
> I tried
> select a,sum(b) from ( select a,count(1) as b from X group by a
> union select a,count(1) as b from Y group by a) group by a
>
> but that gave also an error asking for an alias for the subquery.
>
> How can I solv this problem?
>
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