A key is a combination of one or more columns that is used to identify particular rows in a relation.
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Q29: A deletion anomaly exists when deleting data
Q30: Surrogate keys are normally not shown on
Q31: Relations are classified into normal forms based
Q32: A combination key is a group of
Q33: A constraint that requires an instance of
Q35: A referential integrity constraint is used to
Q36: A row can be uniquely identified by
Q37: A relation can have only one candidate
Q38: A key can be composed of a
Q39: It is possible to have a relation
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