Re: SQL CONSTRAINTS - Constraining time values from two attributes on a table.

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(at)agliodbs(dot)com
and data management solutions (415) 565-7293
for law firms, small businesses fax 621-2533
and non-profit organizations. San Francisco