Oracle SQL Óï¾ä¶Ôʱ¼ä²Ù×÷µÄ×ܽá
ÔÚSQLÓï¾äÖУ¬³£³£Óûá¶Ôʱ¼ä£¨»òÈÕÆÚ£©½øÐÐһЩ´¦Àí£¬ÏÂÃæÊDZȽÏͨÓõÄһЩÓï¾ä£º
ÑÓ³Ù£º
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
ÉÏÔÂÄ©µÄÈÕÆÚ£º
select last_day(add_months(sysdate, -1)) from dual;
±¾ÔµÄ×îºóÒ»Ã룺
select trunc(add_months(sysdate,1),'MM') - 1/24/60/60 from dual
±¾ÖÜÐÇÆÚÒ»µÄÈÕÆÚ£º
select trunc(sysdate,'day')+1 from dual
Äê³õÖÁ½ñµÄÌìÊý£º
select ceil(sysdate - trunc(sysdate, 'year')) from dual;
½ñÌìÊǽñÄêµÄµÚ¼¸ÖÜ :
select to_char(sysdate,'fmww') from dual
½ñÌìÊDZ¾Ôµĵڼ¸ÖÜ:
SELECT TO_CHAR(SYSDATE,'WW') - TO_CHAR(TRUNC(SYSDATE,'MM'),'WW') + 1 AS "weekOfMon" from dual
±¾ÔµÄÌìÊý
SELECT to_char(last_day(SYSDATE),'dd') days from dual
½ñÄêµÄÌìÊý
select add_months(trunc(sysdate,'year'), 12) - trunc(sysdate,'year') from dual
ϸöÐÇÆÚÒ»µÄÈÕÆÚ
SELECT Next_day(trunc(SYSDATE),'monday') from dual
£½£½£½£½£½£½£½£½£½£½£½£½£½£½£½£½£½£½£½£½£½£½£½£½£½£½£½£½£½£½£½£½
¼ÆË㹤×÷ÈÕ·½·¨
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»´øʱ¼äµÄ£¬·ñÔòÔÚËùÓÐÈÕÆÚÇ°¼Ótrunc¼´¿É¡£
Ïà¹ØÎĵµ£º
Ò»£¬OracleÊý¾Ý¿âÓû§¼ò½é
ÔÚOracleÊý¾Ý¿âÖÐÈκζÔÏó¶¼ÊôÓÚÒ»¸öÌض¨Óû§£¬»òÕß˵һ¸öÓû§ÓëͬÃûµÄģʽÏà¹ØÁª¡£
ÒªÁ¬½Óµ½OracleÊý¾Ý¿âÐèÒªÒ»¸öÓû§ÕÊ»§£¬¸ù¾ÝÐèÒªÊÚÓèµÄ²Ù×÷ȨÏÞ¡£
1£¬Ä¬ÈÏÊý¾Ý¿âÓû§Ä£Ê½£º
Sys:Êý¾Ý¿â×ֵ䣨´æ´¢±»¹ÜÀí¶ÔÏóËùÓÐÐÅÏ¢£©ºÍÊÓͼ´æ´¢ÔÚ¸ÃģʽÖС£ÏµÍ³¼¶Óû§¡£ ......
Tablespace
ORACLEÖУ¬±í¿Õ¼äÊÇÊý¾Ý¹ÜÀíµÄ»ù±¾·½·¨£¬ËùÓÐÓû§µÄ¶ÔÏóÒª´æ·ÅÔÚ±í¿Õ¼äÖУ¬Ò²¾ÍÊÇÓû§ÓпռäµÄʹÓÃȨ£¬²ÅÄÜ´´½¨Óû§¶ÔÏó£®·ñÔòÊDz»³äÐí´´½¨¶ÔÏó£¬ÒòΪ¾ÍÊÇÏë´´½¨¶ÔÏó,Èç±í,Ë÷ÒýµÈ£¬Ò²Ã»Óеط½´æ·Å,Oracle»áÌáʾ:ûÓд洢Åä¶î£®
¡¡¡¡Òò´Ë£¬ÔÚ´´½¨¶ÔÏó֮ǰ£¬Ê×ÏÈÒª·ÖÅä´æ´¢¿Õ¼ä£®¡¡¡¡
·ÖÅä´æ ......
1£¬Ê²Ã´ÊÇÓαꣿ
¢Ù´Ó±íÖмìË÷³ö½á¹û¼¯£¬´ÓÖÐÿ´ÎÖ¸ÏòÒ»Ìõ¼Ç¼½øÐн»»¥µÄ»úÖÆ¡£
¢Ú¹ØϵÊý¾Ý¿âÖеIJÙ×÷ÊÇÔÚÍêÕûµÄÐм¯ºÏÉÏÖ´Ðеġ£
ÓÉ SELECT Óï¾ä·µ»ØµÄÐм¯ºÏ°üÀ¨Âú×ã¸ÃÓï¾äµÄ WHERE ×Ó¾äËùÁÐÌõ¼þµÄËùÓÐÐС£ÓɸÃÓï¾ä·µ»ØÍêÕûµÄÐм¯ºÏ½Ð×ö½á¹û¼¯¡£
&n ......
Oracle ÈýÖÖ¼¯ºÏÊý¾ÝÀàÐ͵ıȽÏ:
PL/SQLÖÐûÓÐÊý×éµÄ¸ÅÄËûµÄ¼¯ºÏÊý¾ÝÀàÐͺÍÊý×éÊÇÏàËƵġ£ÔÚ7.3ÒÔÇ°µÄ°æ±¾ÖÐÖ»ÓÐÒ»ÖÖ¼¯ºÏ£¬³ÆΪPL/SQL±í£¬ÔÚÕâÖ®ºóÓÖÓÐÁ½ÖÖ¼¯ºÏÊý¾ÝÀàÐÍ:ǶÌ×±íºÍvarray¡£ÆäÖÐvarray¼¯ºÏÖеÄÔªËØÊÇÓÐÊýÁ¿ÏÞÖƵģ¬index_by±íºÍǶÌ×±íÊÇûÓÐÕâ¸öÏÞÖƵġ£index-by±íÊÇÏ¡ÊèµÄ£¬Ò²¾ÍÊÇ˵ϱê¿ÉÒÔ²»Á¬Ðø ......
½ñÄêµÄOracleÈ«Çò´ó»áÓÚ10ÔÂ11ÈÕ£15ÈÕÔÚÃÀ¹ú¾É½ðɽµÄMosconeÖÐÐÄÒѾÀ¿ªÐòÄ»ÁË¡£
¡¡¡¡ Oracle¶ÔSun¹«Ë¾µÄ³¤Æڼƻ®ÎÞÒÉÊDZ¾´ÎOOW´ó»áµÄ½¹µã¡£µ«ÔÚ̸ÂÛÕâ¸ö»°Ìâ֮ǰ£¬ÎÒÃÇ×¼±¸ÁËÒ»×é´ó»áµÄÓÐȤÊý¾Ý£¬ÏÈÈôó¼Ò¶Ô±¾´Î´ó»áÓиöÕûÌåµÄÓ¡Ïó¡£
¡¡¡¡ÓйØÕû¸ö´ó»áµÄÊý×Ö£º
¡¡¡¡· ½ü4.3ÍòÈ˵½»á
¡¡¡¡· ΪÃÀ¹ ......