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Home -> Community -> Usenet -> comp.databases.theory -> 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 - 08:44:26 CDT
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