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1.ÈÕÆÚʱ¼ä¼ä¸ô²Ù×÷
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select sysdate,sysdate - interval ’7’ MINUTE from dual
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select sysdate - interval ’7’ hour from dual   
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select sysdate - interval ’7’ day from dual
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select sysdate,sysdate - interval ’7’ month from dual
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select sysdate,sysdate - interval ’7’ year from dual
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select sysdate,sysdate - 8 *interval ’2’ hour from dual
2.ÈÕÆÚµ½×Ö·û²Ù×÷
select sysdate,to_char(sysdate,’yyyy-mm-dd hh24:mi:ss’) from dual select sysdate,to_char(sysdate,’yyyy-mm-dd hh:mi:ss’) from dual select sysdate,to_char(sysdate,’yyyy-ddd hh:mi:ss’) from dual select sysdate,to_char(sysdate,’yyyy-mm iw-dhh:mi:ss’) from dual
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select to_date(’2003-10-17 21:15:37’,’yyyy-mm-dd hh24:mi:ss’) from dual
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4. trunk/ ROUNDº¯ÊýµÄʹÓÃ
select trunc(sysdate ,’YEAR’) from dual select trunc(sysdate ) from dual select to_char(trunc(sysdate ,’YYYY’),’YYYY’) from dual
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--·µ»Øµ±Ç°Ê±¼ä ÄêÔÂÈÕСʱ·ÖÃëºÁÃë select to_char(current_timestamp(5),’DD-MON-YYYY HH24:MI:SSxFF’) from dual; --·µ»Øµ±Ç° ʱ¼äµÄÃëºÁÃ룬¿ÉÒÔÖ¸¶¨ÃëºóÃæµÄ¾«¶È(×î´ó=9) select to_char(current_timestamp(9)


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create or replace package GLOBAL_CONSTANT is
  
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    select *from emp where
sal>(select sal from emp where name="SMITH");
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    select e1.ename,e2.ename from
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<CREATE_DATE>2010-3-4.15.57. 30. 505000000</CREATE_DATE>
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