Re: Relation Schemata vs. Relation Variables

> NOT EXISTS
> (SELECT SupplierId
> FROM Suppliers /* before */
> WHERE Status = 20
> EXCEPT
> SELECT SupplierId
> FROM Suppliers' /* after */) ;

Is this an example of, to quote, "a relational expression in the general form of some join between t and t'." ???????????? Received on Mon Aug 21 2006 - 15:44:26 CEST