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create table subject
(
sub_id number not null primary key,
sub_name varchar2(20)not null
)
CREATE OR REPLACE TRIGGER subject_TG
BEFORE INSERT ON subject FOR EACH ROW
BEGIN
SELECT INNERID.NEXTVAL INTO :NEW.sub_id from DUAL;
END;
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create table student
(
stu_id number not null primary key,
stu_name varchar2(20)not null
)
CREATE OR REPLACE TRIGGER student_TG
BEFORE INSERT ON student FOR EACH ROW
BEGIN
SELECT INNERID.NEXTVAL INTO :NEW.stu_id from DUAL;
END;
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