smallkun/class-notes
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smallkun 2025-03-21 09:34:54 +08:00
parent b030ae136a
commit fbb09280fd
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2207/触发器练习题.md
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@ -506,7 +506,7 @@ DELIMITER ;
DELIMITER $$ DELIMITER $$
DROP TRIGGER IF EXISTS before_job_delete; DROP TRIGGER IF EXISTS before_job_delete;
CREATE TRIGGER before_job_delete CREATE TRIGGER before_job_delete
BEFORE DELETE ON employee BEFORE DELETE ON job
FOR EACH ROW FOR EACH ROW
BEGIN BEGIN
IF (SELECT COUNT(*) FROM employee WHERE job_id = OLD.job_id) > 0 THEN IF (SELECT COUNT(*) FROM employee WHERE job_id = OLD.job_id) > 0 THEN