INSERT INTO Enrollments (EnrollmentID, StudentID, CourseID, EnrollmentDate) VALUES (7, NULL, 101, '2023-09-05');Group of answer choicesReferential integrity constraintNo ViolationKey constraintEntity integrity constraint
Question
INSERT INTO Enrollments (EnrollmentID, StudentID, CourseID, EnrollmentDate) VALUES (7, NULL, 101, '2023-09-05');Group of answer choicesReferential integrity constraintNo ViolationKey constraintEntity integrity constraint
Solution
This SQL statement violates the Referential integrity constraint. The Referential integrity constraint ensures that a foreign key value always points to an existing row. It means that if the StudentID in the Enrollments table is a foreign key to the StudentID in the Students table, there must be a valid, existing StudentID in the Students table that the foreign key is referencing.
In the given SQL statement, NULL is being inserted into the StudentID field. This means that there is no actual student being enrolled in the course, which violates the referential integrity constraint because the StudentID doesn't point to any existing student.
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