From: | Merlin Moncure <mmoncure(at)gmail(dot)com> |
---|---|
To: | George Silva <georger(dot)silva(at)gmail(dot)com> |
Cc: | Devrim GÜNDÜZ <devrim(at)gunduz(dot)org>, PGSQL Mailing List <pgsql-general(at)postgresql(dot)org> |
Subject: | Re: Finding the primary key of tables |
Date: | 2010-08-03 19:50:03 |
Message-ID: | AANLkTinuTt8G35Hp-QtWz1f3e+-c6kY9nyRBC7x0YCYM@mail.gmail.com |
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Lists: | pgsql-general |
2010/8/3 George Silva <georger(dot)silva(at)gmail(dot)com>:
> I'm going for Merlin's solution. Its the easiest one :P
>
> But I'm also having a problem:
>
> SELECT column_name FROM information_schema.key_column_usage k
> LEFT OUTER JOIN information_schema.table_constraints ON (k.table_name =
> table_constraints.table_name)
> WHERE
> table_constraints.constraint_type = 'PRIMARY KEY'
> AND k.table_name = 'acidentes'
> AND k.table_schema = 'public'
>
> this still returns me multiple columns. Did I forgot something?
yup -- you are supposed be matching on constraint_name, not just
table_name. try:
SELECT column_name FROM information_schema.key_column_usage k
LEFT OUTER JOIN information_schema.table_constraints USING
(table_schema, table_name, constraint_name)
WHERE
table_constraints.constraint_type = 'PRIMARY KEY'
AND k.table_name = 'acidentes'
AND k.table_schema = 'public'
merlin
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