On 2011-08-23, Herouth Maoz <hero...@unicell.co.il> wrote: > EXCLUDE USING GIST ( customer_id WITH =, is_default WITH AND )
> Basically, each customer can have several rows in this table, but only = > one per customer is allowed to have is_default =3D true. Is this exclude = > constraint correct? I don't really understand exclude, but instead of EXCLUDE... I would do CREATE UNIQUE INDEX "invoice_definitions-unique-default" ON invoice_definitions(customer_id) WHERE is_default; Which would create a smaller (and probably faster) BTREE index containing only the rows with is_default true. There seems to be no way to create this in the create-table command. (using 8.4 here) -- ⚂⚃ 100% natural -- Sent via pgsql-sql mailing list (pgsql-sql@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-sql
