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UANL-Triggers.sql
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UANL-Triggers.sql
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USE [UANL]
DROP TRIGGER deleteAllFromStudent
DROP TRIGGER deleteAllFromTeacher
DROP TRIGGER deleteAllFromClassroom
DROP TRIGGER deleteAllFromSchedule
GO
CREATE TRIGGER deleteAllFromStudent
ON Student
AFTER DELETE AS
DECLARE @id INT
SET @id = (SELECT ID_student FROM deleted)
DELETE FROM Kardex
WHERE ID_student = @id
DELETE FROM StudentSchedule
WHERE ID_student = @id
GO
CREATE TRIGGER deleteALLFromTeacher
ON Teacher
AFTER DELETE AS
DECLARE @id INT
SET @id = (SELECT ID_teacher FROM deleted)
DELETE FROM Schedule
WHERE ID_schedule = @id
DELETE FROM StudentSchedule
WHERE ID_teacher = @id
GO
CREATE TRIGGER deleteAllFromClassroom
ON Classroom
AFTER DELETE AS
DECLARE @id INT
SET @id = (SELECT ID_classroom FROM deleted)
DELETE FROM Schedule
WHERE ID_classroom = @id
DELETE FROM StudentSchedule
WHERE ID_classroom = @id
GO
CREATE TRIGGER deleteAllFromSchedule
ON Schedule
AFTER DELETE AS
DECLARE @id INT
SET @id = (SELECT d.ID_schedule FROM deleted d)
DELETE FROM StudentSchedule
WHERE ID_schedule = @id
GO