Re: Check constraints for varchar[] and varchar[][] columns in a table

Alexander Farber <alexander(dot)farber(at)gmail(dot)com> writes:
> I am trying to add CHECK constraints to the VARCHAR arrays:

> hand1 varchar[7] NOT NULL CHECK (ALL(hand1) ~ '^[*A-Z]$'),

> but get syntax errors near "ALL"
> - probably because that keyword is supposed to be on the right side?

Yeah, the syntax has to be "scalar operator ALL (array)".

> Could anyone please recommend a way to implement check constraints here?

The workaround that's been suggested in the past is to define a reversed
pattern match operator, ie one that has the pattern on the left. There's
no such thing in the core PG distribution, but the only hard part of making
your own is figuring out what to name the operator ;-)

regards, tom lane