Notes
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AFTER INSERT OR UPDATE OF date_of_birth ON students
FOR EACH ROW
WHEN (NEW.date_of_birth IS NOT NULL)
DECLARE
today DATE;
BEGIN
SELECT SYSDATE
INTO today
FROM DUAL;
IF :NEW.date_of_birth > (today-(365*18)) THEN
RAISE_APPLICATION_ERROR(-20000, 'STUDENT IS A CHILD');
ELSE
RAISE_APPLICATION_ERROR(-20000,'STUDENT IS AN ADULT');
END IF;
END trig_dob_ck;
/
SHOW ERRORS;
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