Re: Functional Dependency to constrain a relation to exactly one element?

Alfredo Novoa wrote:
> Alfredo Novoa wrote:
>

>>var R { ... } key { };

Alfredo,

I think he was referring to the existential constraint. Assuming the dbms treats DEE as true, all one needs to provide for the constraint is a projection onto zero attributes:

var R relation { ... } key {} constraint {}, insert R ...; Received on Mon Oct 02 2006 - 07:04:18 CDT