Re: SQL CONSTRAINTS - Constraining time values from two

Maher, Christopher W writes:

> I was looking for a solution on how to write a constraint into a ' create
> table ' expression that would ensure that one ' TIME ' attribute value
> called arrival_time (declared as TIME) is allways constrained to have a
> value that ensures it is allways after another attribute value called
> departure_time (declared as TIME).

create table test (
arrival_time time,
departure_time time,
check (arrival_time < departure_time)
);

insert into test values ('12:00', '14:30');
INSERT 20651 1

insert into test values ('12:00', '9:45');
ERROR: ExecAppend: rejected due to CHECK constraint $1

--
Peter Eisentraut peter_e(at)gmx(dot)net http://funkturm.homeip.net/~peter