24 lines
541 B
MySQL
24 lines
541 B
MySQL
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-- In WHEN, NEW and OLD don't need the colon
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-- Update docencia.cod_pro when profesor.cod_pro changes
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CREATE OR REPLACE TRIGGER cascade_profesor_update
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AFTER UPDATE ON profesor
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FOR EACH ROW
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WHEN (OLD.cod_pro <> NEW.cod_pro)
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BEGIN
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UPDATE docencia
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SET cod_pro = :new.cod_pro
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WHERE cod_pro = :old.cod_pro;
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END;
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/
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-- Delete entries from docencia when profesor is deleted
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CREATE OR REPLACE TRIGGER cascade_profesor_delete
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AFTER DELETE ON profesor
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FOR EACH ROW
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BEGIN
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DELETE FROM docencia
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WHERE cod_pro = :old.cod_pro;
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END;
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/
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