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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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Oracle ÈýÖÖ¼¯ºÏÊý¾ÝÀàÐ͵ıȽÏ:
PL/SQLÖÐûÓÐÊý×éµÄ¸ÅÄËûµÄ¼¯ºÏÊý¾ÝÀàÐͺÍÊý×éÊÇÏàËÆµÄ¡£ÔÚ7.3ÒÔǰµÄ°æ±¾ÖÐÖ»ÓÐÒ»ÖÖ¼¯ºÏ£¬³ÆÎªPL/SQL±í£¬ÔÚÕâÖ®ºóÓÖÓÐÁ½ÖÖ¼¯ºÏÊý¾ÝÀàÐÍ:ǶÌ×±íºÍvarray¡£ÆäÖÐvarray¼¯ºÏÖеÄÔªËØÊÇÓÐÊýÁ¿ÏÞÖÆµÄ£¬index_by±íºÍǶÌ×±íÊÇûÓÐÕâ¸öÏÞÖÆµÄ¡£index-by±íÊÇÏ¡ÊèµÄ£¬Ò²¾ÍÊÇ˵ϱê¿ÉÒÔ²»Á¬Ðø ......
RMAN> startup nomount;
RMAN> sql 'alter session set nls_date_format=''yyyy-mm-dd hh24:mi:ss''";
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RMAN> restore controlfile from autobackup until time '2009-03-10 18:15:00';
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Æô¶¯·þÎñ£ºemctl start dbconsole
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"10","ACCOUNTING","NEW
YORK"
"20","RESEARCH","DALLAS"
"30","SALES","CHICAGO"
"40","OPERATIONS","BOSTON"
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