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

Chris,

> Hi,
> 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??

Easy:

CONSTRAINT arr_dep_time CHECK ( arrival_time > departure_time )

______AGLIO DATABASE SOLUTIONS___________________________
                                       Josh Berkus
  Complete information technology      josh@agliodbs.com
   and data management solutions       (415) 565-7293
  for law firms, small businesses        fax 621-2533
    and non-profit organizations.      San Francisco