When the values in one or more attributes being used as a foreign key must exist in another set of one or more attributes in another table, we have created a(n):(a) Transitive Dependency(b) Insertion Anomaly(c) Referential Integrity Constraint(d) Normal FormI had been asked this question during an interview.This intriguing question comes from Normalization in portion Planning Oracle Applications of Oracle

When the values in one or more attributes being used as a foreign key

1.	When the values in one or more attributes being used as a foreign key must exist in another set of one or more attributes in another table, we have created a(n):(a) Transitive Dependency(b) Insertion Anomaly(c) Referential Integrity Constraint(d) Normal FormI had been asked this question during an interview.This intriguing question comes from Normalization in portion Planning Oracle Applications of Oracle
Answer» Right answer is (c) Referential INTEGRITY Constraint For EXPLANATION I WOULD SAY: Referential Integrity is set of constraints applied to foreign key which prevents ENTERING a row in child table for which you don’t have any corresponding row in parent table i.e. entering NULL or invalid foreign keys.

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