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create sequence emp_sequence
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NOCYCLE -- Ò»Ö±ÀÛ¼Ó£¬²»Ñ»·
CACHE 10; --Ô¤·ÖÅ仺´æ´óСΪ10
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emp_sequence.CURRVAL
emp_sequence.NEXTVAL
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INSERT INTO emp VALUES
(empseq.nextval, 'LEWIS', 'CLERK',7902, SYSDATE, 1200, NULL, 20);
SELECT empseq.currval from DUAL;
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