Search Postgresql Archives

Re: how to find primary key field name?

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 12/10/11 11:54, J.V. wrote:
If I have a table name, I know how to find the primary key constraint name, but see no way to find the primary key field name.

select constraint_name from information_schema.tabale_constraints where table_name = <table_name> and constraint_type = 'PRIMARY KEY';

will return the constraint name, but given the table_name and the constraint_name, how do I find the database column/field name associated with that primary key?

J.V.

I think this version is probably more directly useful, and a bit simpler:

SELECT
    ci.relname AS "Index",
    a.attname AS "Primary Key Col"
FROM
    pg_index i
        JOIN pg_class cr ON (cr.oid = i.indrelid)
            JOIN pg_attribute a ON (a.attrelid = cr.oid)
        JOIN pg_class ci ON (ci.oid = i.indexrelid)
WHERE
    i.indisprimary AND
    cr.relname = 'salary' AND
    EXISTS (SELECT 1 FROM unnest(i.indkey) p(c) WHERE p.c = a.attnum)
ORDER BY
    a.attname


Cheers,
Gavin
/**/;/**/


--
Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-general


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Index of Archives]     [Postgresql Jobs]     [Postgresql Admin]     [Postgresql Performance]     [Linux Clusters]     [PHP Home]     [PHP on Windows]     [Kernel Newbies]     [PHP Classes]     [PHP Books]     [PHP Databases]     [Postgresql & PHP]     [Yosemite]
  Powered by Linux