Re: correlated query as a column and where clause

Hello Harald,

Danke ! . My concern is why I get error undefiend attribute if I used the alias
in the where clause

Regards

________________________________
From: Harald Armin Massa <harald(at)2ndQuadrant(dot)com>
To: salah jubeh <s_jubeh(at)yahoo(dot)com>
Cc: pgsql <pgsql-general(at)postgresql(dot)org>
Sent: Fri, April 15, 2011 5:26:45 PM
Subject: Re: [GENERAL] correlated query as a column and where clause

I am wondering, why I can not add the following ' A > 10' in the where
clause i.e. 'where nspname !~* 'pg_' and A > 10'
>
>Select nspname, (SELECT count(*) as count FROM pg_tables where schemaname =
>nspname) as A
>
>FROM pg_namespace
>where nspname !~* 'pg_'
>
>
>
what you are looking for is the having clause

Select nspname, count(1)
FROM pg_tables
where nspname !~* 'pg_'
group by nspname
having count(1) >10

best wishes

Harald

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