Ò׽ؽØÍ¼Èí¼þ¡¢µ¥Îļþ¡¢Ãâ°²×°¡¢´¿ÂÌÉ«¡¢½ö160KB

oracle³£ÓõÄÈÕÆÚº¯Êý

À´Ô´£¨http://www.javaeye.com/topic/190221£©
Ò»¡¢ ³£ÓÃÈÕÆÚÊý¾Ý¸ñʽ
1.Y»òYY»òYYY ÄêµÄ×îºóһ룬Á½Î»»òÈýλ
SQL> Select to_char(sysdate,'Y') from dual;
TO_CHAR(SYSDATE,'Y')
--------------------
7
SQL> Select to_char(sysdate,'YY') from dual;
TO_CHAR(SYSDATE,'YY')
---------------------
07
SQL> Select to_char(sysdate,'YYY') from dual;
TO_CHAR(SYSDATE,'YYY')
----------------------
007
2.Q ¼¾¶È 1¡«3ÔÂΪµÚÒ»¼¾¶È£¬2±íʾµÚ¶þ¼¾¶È¡£
SQL> Select to_char(sysdate,'Q') from dual;
TO_CHAR(SYSDATE,'Q')
--------------------
2
3.MM Ô·ÝÊý
SQL> Select to_char(sysdate,'MM') from dual;
TO_CHAR(SYSDATE,'MM')
---------------------
05
4.RM Ô·ݵÄÂÞÂí±íʾ £¨VÔÚÂÞÂíÊý×ÖÖбíʾ 5£©
SQL> Select to_char(sysdate,'RM') from dual;
TO_CHAR(SYSDATE,'RM')
---------------------
V
5.Month ÓÃ9¸ö×Ö·û³¤¶È±íʾµÄÔ·ÝÃû
SQL> Select to_char(sysdate,'Month') from dual;
TO_CHAR(SYSDATE,'MONTH')
------------------------
5ÔÂ
6.WW µ±ÄêµÚ¼¸ÖÜ £¨2007Äê5ÔÂ29ÈÕΪ2007ÄêµÚ22ÖÜ£©
SQL> Select to_char(sysdate,'WW') from dual;
TO_CHAR(SYSDATE,'WW')
---------------------
22
7.W ±¾Ôµڼ¸ÖÜ £¨2007Äê5ÔÂ29ÈÕΪ5ÔµÚ5ÖÜ£©
SQL> Select to_char(sysdate,'W') from dual;
TO_CHAR(SYSDATE,'W')
--------------------
5
8.DDD µ±ÄêµÚ¼¸Ìì £¨2007Äê5ÔÂ29ÈÕΪ2007ÄêµÚ149Ì죩
SQL> Select to_char(sysdate,'DDD') from dual;
TO_CHAR(SYSDATE,'DDD')
----------------------
149
9. DD µ±Ôµڼ¸Ìì
SQL> Select to_char(sysdate,'DD') from dual;
TO_CHAR(SYSDATE,'DD')
---------------------
29
10.D ÖÜÄÚµÚ¼¸Ìì
SQL> Select to_char(sysdate,'D') from dual;
TO_CHAR(SYSDATE,'D')
--------------------
3
11.DY ÖÐÎĵÄÐÇÆÚ¼¸ £¨ £¨2007Äê5ÔÂ29ÈÕΪÐÇÆÚ¶þ£©£©
SQL> Select to_char(sysdate,'DY') from dual;
TO_CHAR(SYSDATE,'DY')
---------------------
ÐÇÆÚ¶þ
12.HH»òHH12 12½øÖÆÐ¡Ê±Êý £¨16£º09·ÖΪÓÃ12Ð¡Ê±ÖÆ¼ÆÊ±Îª4µã£©
SQL> Select to_char(sysdate,'HH') from dual;
TO_CHAR(SYSDATE,'HH')
---------------------
04
13.HH24 24Ð¡Ê±ÖÆ
SQL> Select to_char(sysdate,'HH24') from dual;
TO_CH


Ïà¹ØÎĵµ£º

oracle ±í¿Õ¼ä²Ù×÷

oracle±í¿Õ¼ä²Ù×÷Ïê½â
  1
  2
  3×÷Õߣº   À´Ô´£º    ¸üÐÂÈÕÆÚ£º2006-01-04 
  5
  6 
  7½¨Á¢±í¿Õ¼ä
  8
  9CREATE TABLESPACE data01
 10DATAFILE '/ora ......

ORACLE±¸·Ý²ßÂÔ(ORACLE BACKUP STRATEGY)

ORACLE±¸·Ý²ßÂÔ(ORACLE BACKUP STRATEGY)
2007Äê11ÔÂ02ÈÕ ÐÇÆÚÎå 16:03
¸ÅÒª
1¡¢Á˽âʲôÊDZ¸·Ý
2¡¢Á˽ⱸ·ÝµÄÖØÒªÐÔ
3¡¢Àí½âÊý¾Ý¿âµÄÁ½ÖÖÔËÐз½Ê½
4¡¢Àí½â²»Í¬µÄ±¸·Ý·½Ê½¼°ÆäÇø±ð
5¡¢Á˽âÕýÈ·µÄ±¸·Ý²ßÂÔ¼°ÆäºÃ´¦
  
Ò»¡¢Á˽ⱸ·ÝµÄÖØÒªÐÔ
¿ÉÒÔ˵£¬´Ó¼ÆËã»úϵͳ³öÊÀµÄÄÇÌìÆð£¬¾ÍÓÐÁ˱¸·ÝÕâ¸ö¸ÅÄ ......

ORACLE ÐÐתÁÐ ÓùýµÚÒ»¸öЧ¹û²»ËãÌ«ºÃ£¡

Êý¾Ý¿â²éѯÖÐÄÑÃâ»áÓöµ½ÐÐÁÐת»»µÄÇé¿ö£¬ÕªÁÐһЩ½Ï¾«µäµÄ½â¾ö·½°¸
--####################################################################
Ò»¡¢²ÉÓÃSQL decodeºÍPL/SQLº¯ÊýʵÏÖ
--####################################################################
1¡¢¹Ì¶¨ÁÐÊýµÄÐÐÁÐת»»
Èç
student subject grade
------ ......

oracle id ×ÔÔö

oracleÈÃid×Ô¶¯Ôö³¤£¨insertʱ²»ÓÃÊÖ¶¯²åÈëid£©µÄ°ì·¨£¬ÏñMysqlÖеÄauto_incrementÄÇÑù
´´½¨ÐòÁÐ  
  create   sequence   emp_seq  
  increment   by   1  
  start   with   1  
  nomaxvalue  
  nocycle  
  ......

OracleÖеİ󶨱äÁ¿

°ó¶¨±äÁ¿¾ÍÊÇÄܹ»Ìæ´úSQLÓï¾äÖг£Á¿µÄÌæ´ú±äÁ¿
×÷Óãº
    °ó¶¨±äÁ¿Ö»ÊÇÆðµ½Õ¼Î»µÄ×÷Óã¬Í¬ÃûµÄ°ó¶¨±äÁ¿²¢²»Òâζ×ÅÔÚËüÃÇÊÇͬÑùµÄ£¬ÔÚ´«µÝʱҪ¿¼ÂǵÄÊÇ´«µÝµÄÖµÓë°ó¶¨±äÁ¿³öÏÖ˳ÐòµÄ¶Ô룬¶ø²»Êǰ󶨱ä Á¿µÄÃû³Æ¡£
°ó¶¨±äÁ¿ÊÇÔÚͨ³£Çé¿öÏÂÄÜÌáÉýЧÂÊ£¬·ÇÕý³£µÄÇé¿öÈçÏ£º
ÔÚ×Ö¶Î(°üÀ¨×ֶμ¯)½¨ÓÐË÷Òý£¬Ç ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ