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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
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      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; 
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