Re: SQL CONSTRAINTS - Constraining time values from two attributes on - Mailing list pgsql-sql

> 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). 
> Any know how this constraint would be written??
> 

CREATE TABLE tablename (arrival_time        timestamp,departure_time        timestamp CHECK (arrival_time <
departure_time)
);