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CREATE TABLE TEST
(
ID NUMBER PRIMARY KEY,
NAME VARCHAR2(20)
);
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CREATE SEQUENCE SEQ_TEST;
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CREATE OR REPLACE TRIGGER AUTOINCREMENT
BEFORE INSERT ON TEST
FOR EACH ROW
WHEN (NEW.ID IS NULL)
BEGIN
SELECT SEQ_TEST.NEXTVAL INTO :NEW.ID from DUAL;
END;
/
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INSERT INTO TEST(NAME) VALUES('increase');
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SELECT * from TEST;