Re: [SQL] SQL-Query 2 get primary key

Thus spake Marc Grimme
> if I create a table like this:
> CREATE TABLE test (
> id decimal(3) primary key,
> name varchar(32));
>
> how can I ask postgres which is the primary key from table test?

SELECT pg_class.relname, pg_attribute.attname
FROM pg_class, pg_attribute, pg_index
WHERE pg_class.oid = pg_attribute.attrelid AND
pg_class.oid = pg_index.indrelid AND
pg_index.indkey[0] = pg_attribute.attnum AND
pg_index.indisprimary = 't';

That lists all the primary keys in your database. Add a "WHERE pg_class
= 'test'" clause to get the specific table.

Note that this makes the assumption that only one field can be in the
primary key (no complex primary keys) but I don't think there will
ever be more than one the way we declare it now.

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