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 )
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