table constraint on two columns

Postgres 9.2.4.

I have two columns, approved and comments. Approved is a boolean with no
default value and comments is a character varying (255) and nullable.

I am trying to create a constraint that will not allow a row to be entered
if approved is set to false and comments is null.

This does not work. yada, yada, yada... add constraint "chk_comments' check
(approved = false and comments is not null). The constraint is successfully
added, but does not work as I expected.



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