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oracleµÄ³éÈ¡º¯ÊýÊÇ extrac()Óï·¨:
SELECT EXTRACT(YEAR from SYSDATE) from DUAL; return Current Year
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sal>(select sal from emp where name="SMITH");
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    select e1.ename,e2.ename from
emp e1,emp e2 where e1.mgr=e2.empno(+);
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