Triggers and Active Databases
Before Trigger Example (row granularity) CREATE TRIGGER Max_EnrollCheck BEFORE INSERT ON Transcript REFERENCING NEW AS N --row to be added FOR EACH ROW WHEN ((SELECT COUNT (T.StudId) FROM Transcript T WHERE T.CrsCode = N.CrsCode AND T.Semester = N.Semester) >= (SELECT C.MaxEnroll FROM Course C WHERE C.CrsCode = N.CrsCode )) ROLLBACK. Lab 6 … ................
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