Question

Consider the following relation definitions: STUDENT( Student_Number: integer NOT NULL Name: variable length character string length 20 ) Primary Key Student_Number HOUSING( Housing_ID: integer NOT NULL Student_Number: integer NOT NULL Building: variable length character string length 25 ) Primary Key Housing_ID Foreign Key Student_Number References STUDENT(Student_Number) ON DELETE NO ACTION ON UPDATE CASCADE What are the referential constraints for the relations defined in these relation definitions?

Accepted Answer

Modifications to STUDENT(Student_Number) are automatically reflected in changes to HOUSING(Student_Number). For a deletion to occur from STUDENT(Student_Number), it must first occur in HOUSING(Student_Number).

Answer

There is no relationship between changes in STUDENT(Student_Number) and HOUSING(Student_Number).

Answer

When STUDENT(Student_Number) is changed or deleted, this modification or deletion will automatically be reflected in HOUSING(Student_Number).

Answer

Modifications to HOUSING(Student_Number) are automatically reflected in changes to STUDENT(Student_Number), but deletions are not permitted.

Consider the following relation definitions: STUDENT( Student_Number: integer NOT NULL Name: variable length character string length 20 ) Primary Key…

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