If you were in a company and your boss told you a QA position just opened up, he would be talking about the Quality Assurance Department. They make sure things are done right.
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The domain of the inverse of a relation is the range of the relation. Similarly, the range of the inverse of a relation is the domain of the relation.
difference between relation sehema and relation instance in dbms
No, a function must be a relation although a relation need not be a functions.
A relation doesn't have an "output value", in the sense that a function does. A set of values is either part of the relation, or it isn't.
EFI is the Expeditionary Forces Institute, members join when in a hostile zone, and are members of the TA. NCS is the Naval Canteen service, you would join this when aboard a ship.