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sysdate+(5/24/60/60)          ÔÚϵͳʱ¼ä»ù´¡ÉÏÑÓ³Ù5Ãë
sysdate+5/24/60               ÔÚϵͳʱ¼ä»ù´¡ÉÏÑÓ³Ù5·ÖÖÓ
sysdate+5/24                  ÔÚϵͳʱ¼ä»ù´¡ÉÏÑÓ³Ù5Сʱ
sysdate+5                     ÔÚϵͳʱ¼ä»ù´¡ÉÏÑÓ³Ù5Ìì
add_months(sysdate,-5)        ÔÚϵͳʱ¼ä»ù´¡ÉÏÑÓ³Ù5ÔÂ
add_months(sysdate,-5*12)     ÔÚϵͳʱ¼ä»ù´¡ÉÏÑÓ³Ù5Äê
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select last_day(add_months(sysdate, -1)) from dual;
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select trunc(add_months(sysdate,1),'MM') - 1/24/60/60 from dual
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select trunc(sysdate,'day')+1 from dual
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select ceil(sysdate - trunc(sysdate, 'year')) from dual;
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select to_char(sysdate,'fmww') from dual
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SELECT TO_CHAR(SYSDATE,'WW') - TO_CHAR(TRUNC(SYSDATE,'MM'),'WW') + 1 AS "weekOfMon" from dual
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SELECT to_char(last_day(SYSDATE),'dd') days from dual
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select add_months(trunc(sysdate,'year'), 12) - trunc(sysdate,'year') from dual
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SELECT Next_day(trunc(SYSDATE),'monday') from dual
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create table t(s date,e date);
alter session set nls_date_format = 'yyyy-mm-dd';
insert into t values('2003-03-01','2003-03-03');
insert into t values('2003-03-02','2003-03-03');
insert into t values('2003-03-07','2003-03-08');
insert into t values('2003-03-07','2003-03-09');
insert into t values('2003-03-05','2003-03-07');
insert into t values('2003-02-01','2003-03-31');
-- ÕâÀï¼Ù¶¨ÈÕÆÚ¶¼ÊDz»´øÊ±¼äµÄ£¬·ñÔòÔÚËùÓÐÈÕÆÚǰ¼Ótrunc¼´¿É¡£
    
     
	
	
    
    
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