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For those system catalogs that have a unique indexes, make a primary key and unique constraint, using ALTER TABLE ... PRIMARY KEY/UNIQUE USING INDEX. This can be helpful for GUI tools that look for a primary key, and it might in the future allow declaring foreign keys, for making schema diagrams. The constraint creation statements are automatically created by genbki.pl from DECLARE_UNIQUE_INDEX directives. To specify which one of the available unique indexes is the primary key, use the new directive DECLARE_UNIQUE_INDEX_PKEY instead. By convention, we usually make a catalog's OID column its primary key, if it has one. Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://www.postgresql.org/message-id/flat/dc5f44d9-5ec1-a596-0251-dadadcdede98@2ndquadrant.com |
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