wiki.techinc.nl/maintenance/postgres/archives/patch-interwiki-pk.sql

ALTER TABLE interwiki
 DROP CONSTRAINT interwiki_iw_prefix_key,
 ADD PRIMARY KEY (iw_prefix);
Convert numerous UNIQUE INDEX to PRIMARY KEY MySQL, SQLite, PostgreSQL and MSSQL done with transitional patches. One additional duplicate index removed from PostgreSQL schema. Having a PK is essential to do maintenance, specially on large tasks. By not having a PK it is impossible to add it in a safe way if not done directly on the master. Having a PK means that we can easily change the PK into another one if needed in the future. The ones we chose might not be the best ones, but will allow us to get them changed. Bug: T198811 Change-Id: I6b96a427687085c6c24bcd759c9739f81288b919 2018-07-04 19:13:07 +00:00			`ALTER TABLE interwiki`
			`DROP CONSTRAINT interwiki_iw_prefix_key,`
			`ADD PRIMARY KEY (iw_prefix);`