Hi Friends ,

Lets Understand the Sequence with Examples

Create  SEQUENCE XXEMPNO_SEQ
START WITH 100
MAXVALUE   500
INCREMENT BY 1;

Select XXEMPNO_SEQ.NEXTVAL from dual;
Select XXEMPNO_SEQ.CURRVAL from dual;

Create TABLE XXGH(EMPNO NUMBER, ENAME VARCHAR2(30));
Select * from XXGH;
COMMIT;
UPDATE XXGH SET EMPNO=106 where EMPNO=109;
INSERT INTO XXGH(EMPNO,ENAME) VALUES(XXEMPNO_SEQ.NEXTVAL,'ANI');
COMMIT;

DELETE FROM XXGH WHERE ROWID NOT IN (SELECT MAX(ROWID) FROM XXGH GROUP BY EMPNO);
Select * from  XXGH WHERE ROWID NOT IN (SELECT MAX(ROWID) FROM XXGH GROUP BY EMPNO)
/

SELECT * FROM USER_OBJECTS WHERE OBJECT_NAME='XXEMPNO_SEQ'

SELECT * FROM USER_SEQUENCES WHERE SEQUENCE_NAME='XXEMPNO_SEQ';

Select rownum ,E.* from EMP E order BY ENAME;
/
Select rownum ,E.* from EMP E  where DEPTNO=30 ;

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