![]() (Disjoint less constraint means that an entity can be a member of at most one of the subclasses of the specialization.) ![]() (D) An entity can be joined with another entity in the same level entity set.Įxplanation: Disjoint less constraint requires that an entity belongs to no more than one level entity set. (C) The database must contain an unmatched foreign key value. (B) The same entity may belong to more than one level. (A) It requires that an entity belongs to no more than one level entity set. (ORDER BY clause is used to arrange the result of the SELECT statement) The clause in SQL that specifies that the query result should be sorted in ascending or descending order based on the values of one or more columns isĮxplanation: The clause in SQL that specifies that the query result should be sorted in ascending or descending order based on the values of one or more columns is ORDER BY. (Referential integrity constraint is concerned with foreign key) The rule that a value of a foreign key must appear as a value of some specific table is called aĮxplanation: The rule that a value of a foreign key must appear as a value of some specific table is called a referential constraint. The language that requires a user to specify the data to be retrieved without specifying exactly how to get it is
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