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

һЩoracleµÄÃüÁî¼°º¯Êý °üÀ¨decodeµÈ


 1¡¢set linesize 100;  ÉèÖó¤¶È   
 2¡¢set pagesize 30;   ÉèÖÃÿҳÏÔʾÊýÄ¿   
 3¡¢em a.sql  ´ò¿ª¼Çʱ¾     
 4¡¢@ a Ö´ÐÐÎļþaÖеĴúÂ룬¿ÉÖ¸¶¨ÎļþµÄ·¾¶ @d:a.txt   
 5¡¢conn Óû§Ãû/ÃÜÂë  ¸ù¾ÝÓû§ÃûºÍÃÜÂëÁ¬½ÓÊý¾Ý¿â Èç¹ûÁ¬½Ó³¬¼¶¹ÜÀíÔ±(sys) ÔòÓ¦¼ÓÉÏas sysdba;   
 6¡¢show user; ÏÔʾµ±Ç°Á¬½ÓµÄÓû§   
 7¡¢select * from tab;  µÃµ½µ±Ç°Óû§ÏµÄËùÓÐ±í   
 8¡¢desc temp; ²é¿´±í½á¹¹   
 9¡¢/  ¼ÌÐøÖ´ÐÐÉÏÒ»¸ö²éѯÓï¾ä   
    clear scr;  ÇåÆÁ   
  
×Ö·ûº¯Êý   
10¡¢select upper('coolszy') from dual; ½«Ð¡Ð´×Öĸת»»³É´óд£¬dual ÎªÒ»Ðé±í   
11¡¢select lower('KUKA') from dual; ½«´óд×Öĸת»»³ÉСд   
12¡¢select initcap('kuka') from dual; ½«Ê××Öĸ´óд    
13¡¢select concat('Hello',' world') from dual; Á¬½Ó×Ö·û´®£¬µ«Ã»ÓÐ||ºÃÓÃselect concat('Hello','world') from dual;   
14¡¢select substr('hello',1,3) from dual; ½ØÈ¡×Ö·û´®   
15¡¢select length('hello') from dual; Çó×Ö·û´®³¤¶È   
16¡¢select replace('hello','l','x') from dual; Ìæ»»×Ö·û´®    
17¡¢select substr('hello',-3,3) from dual; ½ØÈ¡ºóÈýλ   
  
ÊýÖµº¯Êý   
18¡¢select round(789.536) from dual; ËÄÉáÎåÈ룬ÉáȥСÊý   
19¡¢select round(789.536,2) from dual; ±£ÁôÁ½Î»Ð¡Êý   
20¡¢select round(789.536,-1) from dual; ¶ÔÕûÊý½øÐÐËÄÉáÎåÈë   
21¡¢select trunc(789.536) from&n


Ïà¹ØÎĵµ£º

oracleÖ®DBWn½ø³Ì

    DBWn½ø³Ì¸ºÔð½«ÔàÊý¾Ý¿éдÈë´ÅÅÌ¡£ËüÊÇÒ»¸ö·Ç³£ÖØÒªµÄ½ø³Ì£¬Ëæ×ÅÄÚ´æµÄÔö¼Ó£¬Ò»¸öDBWn½ø³Ì¿ÉÄܲ»¹»ÓÃÁË¡£´Óoracle8iÆð£¬ÎÒÃÇ¿ÉÒÔΪϵͳÅäÖöà¸öDBWn½ø³Ì¡£³õʼ»¯²ÎÊýdb_writer_process¾ö¶¨ÁËÆô¶¯¶àÉÙ¸öDBWn½ø³Ì¡£Ã¿¸öDBWn½ø³Ì¶¼»á·ÖÅäÒ»¸öcache lru chain latch¡£
   DBWn×÷Ϊһ¸öºǫ́½ø³Ì£¬ ......

Oracleѧϰ±Ê¼Ç4 ÉÔ¸´ÔӵIJéѯºÍ·ÖÒ³

ÈÔȻʹÓÃSCOTTÓû§À´²Ù×÷£º
1¡¢         ÏÔʾ¹¤×ʱȲ¿ÃÅ30µÄËùÓÐÔ±¹¤µÄ¹¤×ʶ¼¸ßµÄÔ±¹¤µÄÐÅÏ¢£º
Select * from emp where sal>all(select sal from emp where deptno=30);
2¡¢         ÏÔʾ¹¤×ʱȲ¿ÃÅ30µÄÈÎÒâÒ»¸öÔ±¹¤µÄ¹¤×ʸ߾ͿÉÒ ......

oracle HINTS µÄʹÓÃ

Õª×ÔÐìÓñ½ðµÄ<<sqlÐÔÄܵĵ÷Õû-×ܽá>>
ÈçºÎʹÓÃhints:
HintsÖ»Ó¦ÓÃÔÚËüÃÇËùÔÚsqlÓï¾ä¿é(statement block£¬ÓÉselect¡¢update¡¢delete¹Ø¼ü×Ö±êʶ)ÉÏ£¬¶ÔÆäËüSQLÓï¾ä»òÓï¾äµÄÆäËü²¿·ÖûÓÐÓ°Ïì¡£È磺¶ÔÓÚʹÓÃunion²Ù×÷µÄ2¸ösqlÓï¾ä£¬Èç¹ûÖ»ÔÚÒ»¸ösqlÓï¾äÉÏÓÐhints£¬Ôò¸Ãhints²»»áÓ°ÏìÁíÒ»¸ösqlÓï¾ä¡£
ÎÒÃÇ¿ÉÒÔÊ ......

Oracle±£´æ´ó¶ÔÏóBLOB

×î½üÔÚʹÓÃOracle×öÎļþÉÏ´«£¬ÒªÇó½«ÎļþÊý¾Ý±£´æµ½Êý¾Ý¿âÖС£OracleÌṩÁËBlobÓÃÀ´´æ´¢¶þ½øÖÆ´ó¶ÔÏóÊý¾Ý£¬¿ÉÊÇËüºÍJava.sqlÀïÃæµÄBlob²»¼æÈÝ£¬¾­³£µ¼ÖÂBlob×Ö¶ÎÎÞ·¨Ëø¶¨»òÕß²Ù×÷ʧ°Ü¡£ÓÉÓÚÒÔǰûÓÐ×ö¹ýÕâÑùµÄÀý×Ó£¬ËùÒÔ»¨Á˲»ÉÙʱ¼ä²Å½â¾ö¡£
ÎÒʹÓõÄÊÇstruts2.1.8+spring2.5+hibernate3.2£¬ÏÂÃæÊÇÏà¹Ø´úÂ룺
springÅäÖÃ ......

ÈçºÎÔÚoracleÖе¼Èëµ¼³ödmpÎļþ[ת]

¡¡¡¡OracleÊý¾Ýµ¼Èëµ¼³öimp/exp¾ÍÏ൱ÓÚoracleÊý¾Ý»¹Ô­Ó뱸·Ý¡£expÃüÁî¿ÉÒÔ°ÑÊý¾Ý´ÓÔ¶³ÌÊý¾Ý¿â·þÎñÆ÷µ¼³öµ½±¾µØµÄdmpÎļþ£¬impÃüÁî¿ÉÒÔ°ÑdmpÎļþ´Ó±¾µØµ¼Èëµ½Ô¶´¦µÄÊý¾Ý¿â·þÎñÆ÷ÖС£ ÀûÓÃÕâ¸ö¹¦ÄÜ¿ÉÒÔ¹¹½¨Á½¸öÏàͬµÄÊý¾Ý¿â£¬Ò»¸öÓÃÀ´²âÊÔ£¬Ò»¸öÓÃÀ´ÕýʽʹÓÃ……
 
¡¡¡¡OracleÊý¾Ýµ¼Èëµ¼³öimp/exp¾ÍÏàµ±Ó ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ