> Another nice (but no doubt more complex) thing would be ability to add
> multiple constraints at once, needing only one seqscan to check for
> compliance with added constraints and/or making constraint checks
> smarter, so that for.ex. "ADD CONSTRAINT CHECK i > 0" could make use of
> index on i instead of doing a seqscan. Or if there is a constraint
> "CHECK i > 0" then adding another like "CHECK i > -1" would not need to
> check actual data either.
Check out the comma in alter table.
ALTER TABLE tab ADD COLUMN serial NOT NULL UNIQUE,
ADD CHECK (foo > 24),
ADD CHECK (baz < 18),
ADD COLUMN integer NOT NULL DEFAULT 32;
Table tab (and each of the tables that inherits from it) is scanned and
rewritten once.
I believe this was added for 8.0.
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TIP 2: Don't 'kill -9' the postmaster
