What is the functions of on delete cascade?(a) It is used to delete a tuple in a table(b) It is used to specify the precise attribute that needs to be deleted in a single relation.(c) It is used to preserve referential integrity in a relation(d) It is used to execute sub-queries in the from clause.The question was asked by my college professor while I was bunking the class.Question is from Integrity Constraints in section Intermediate and Advanced Sql of RDBMS

What is the functions of on delete cascade?(a) It is used to delete a

1.	What is the functions of on delete cascade?(a) It is used to delete a tuple in a table(b) It is used to specify the precise attribute that needs to be deleted in a single relation.(c) It is used to preserve referential integrity in a relation(d) It is used to execute sub-queries in the from clause.The question was asked by my college professor while I was bunking the class.Question is from Integrity Constraints in section Intermediate and Advanced Sql of RDBMS
Answer» Right choice is (C) It is used to preserve referential integrity in a RELATION The EXPLANATION is: It is used to preserve referential integrity in the relation. When an attribute of a relation is the foreign key in another relation, deleting it causes referential integrity problems. The on delete CASCADE solves this problem by forcing us to delete the foreign key FIRST.

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