robertmh...@gmail.com (Robert Haas) writes: > On Mon, May 4, 2009 at 10:10 AM, Andres Freund <and...@anarazel.de> wrote: >> Would a patch adding 'IF EXISTS' support to: >> - ALTER TABLE ... DROP COLUMN >> - ALTER TABLE ... DROP CONSTRAINT >> possibly be accepted? >> >> Having it makes the annoying task of writing/testing of schema-upgrade >> scripts a bit easier. > > Can't speak for the committers, but I've wished for this a time or two myself.
For constraints, it's easy enough to treat that as idempotent; it's no big deal to drop and re-add a constraint. For columns, I'd *much* more frequently be interested in ALTER TABLE ... ADD COLUMN IF NOT EXISTS ... Note that this is distinctly NOT the same as: ALTER TABLE ... DROP COLUMN IF EXISTS ... ALTER TABLE ... ADD COLUMN ... -- (format nil "~...@~s" "cbbrowne" "linuxdatabases.info") http://linuxdatabases.info/info/lisp.html Signs of a Klingon Programmer - 10. "A TRUE Klingon Warrior does not comment his code!" -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
