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1.sqlplus-----¿ªÆô·þÎñ
2.ÊäÈëÓû§ÃûºÍÃÜÂ루ĬÈÏ3¸öÓû§,×¢Ò⣬ÃÜÂëÊÇ¿ÉÒÔÐ޸ĵģºsystem/manager;scott/tiger;sys/change_on_install£©£¬Á¬½ÓÊý¿â¡£
3.´´½¨±í¿Õ¼ä£º
 create tablespace ±í¿Õ¼äÂß¼­Ãû datafile '±í¿Õ¼äÎļþµÄÎïÀíÂß¼­'
 size Îļþ´óС£¨È磺10m£© autoextend ÊÇ·ñ×Ô¶¯Ôö³¤Îļþ´óС£¨on/off£©;
4.´´½¨Óû§£ºcreate user Óû§Ãû identified by ÃÜÂ룻
5.Óû§ÊÚȨ£ºgrant connect to Óû§Ãû  --------±íʾÊÚÓèÓû§Á¬½ÓµÄȨÏÞ
     grant dba to Óû§Ãû  ------±íʾÊÚÓè¹ÜÀíÔ±µÄȨÏÞ
     grant resource to Óû§Ãû -----±íʾ´´½¨Ò»¸öȨÏÞ¶ÔÏó
     --Á¬½Ó
     conn admin/admin;
     --Á¬½Óµ±Ç°Óû§
     conn yangjian/yangjian;
     --ÐÞ¸ÄÓû§ÃÜÂë
     alter user system identified by system;
     --ɾ³ýÓû§(cascadeɾ³ýģʽ¶ÔÏó)
     drop user admin cascade;
6.exit  -----Í˳öÁ¬½Ó
7.´´½¨±í£º
 create table ±íÃ÷
 £¨
  sid varchar2(20),    --varchar2±íʾ¶¯Ì¬µÄ×Ö·ûÀàÐÍ
  sage int   ----Êý×ÖÀàÐÍ
 £©;
 --ɾ³ý±í¿Õ¼ä
 Drop tablespace spac
 --Ð޸ıí
 --1.Ϊָ¶¨µÄ±íÌí¼ÓÒ»ÁÐ
 alter table student add(score varchar2(3))
 --2.ÐÞ¸ÄÖ¸¶¨ÁÐ
 alter table student modify(score number(3,1))
 --3.ɾ³ýÖ¸¶¨µÄÁÐ
 alter table student drop column score
 --4.²é¿´Ö¸¶¨±íµÄ½á¹¹
 desc student
 --ɾ³ý±í
 --1.ֻɾ³ý±íÖеÄËùÓÐÊý¾Ý£¬±£Áô±íµÄ½á¹¹
 truncate table student
 delete student;
 --2.ɾ³ýÕû¸ö±í£¬°üÀ¨±íµÄÕû¸ö½á¹¹
 drop table student
8.show user   ------ÏÔʾµ±Ç°µÇ½Óû§Ãû
9.´´½¨Ò»¸öÐòÁУº
 create sequence  ÐòÁÐÃû start with 1 increment by 2 minvalue 1 maxvalue 2000
 cycle/uncycle;     -----±íʾ¸ÃÐòÁдÓ1¿ªÊ¼£¬×ÔÔö2£¬×îСֵ1£¬×î´óÖµ2000£¬cycle±íʾµ½´ï×î´óÖµºó    


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select sum(bytes)/(1024*1024) as free_space,tablespace_name
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SQLServerºÍOracleµÄ³£Óú¯Êý¶Ô±È

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S:select abs(-1) value
O:select abs(-1) value from dual
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S:select ceiling(-1.001) value
O:select ceil(-1.001) value from dual
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S:select floor(-1.001) value
O:select floor(-1.001) value from dual
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oracle ´æ´¢¹ý³ÌµÄ»ù±¾Óï·¨

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CREATE OR REPLACE PROCEDURE ´æ´¢¹ý³ÌÃû×Ö
(
    ²ÎÊý1 IN NUMBER,
    ²ÎÊý2 IN NUMBER
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±äÁ¿1 INTEGER :=0;
±äÁ¿2 DATE;
BEGIN
END ´æ´¢¹ý³ÌÃû×Ö
2.SELECT INTO STATEMENT
  ½«select²éѯµÄ½á¹û´æÈëµ½±äÁ¿ÖУ¬¿ÉÒÔͬʱ½«¶à¸öÁд洢¶à¸ö±äÁ¿ÖУ¬±ØÐëÓÐÒ»Ì ......

Oracle Connect ByÓ÷¨

Oracle Connect ByÓ÷¨
 
oracleÖеÄselectÓï¾ä¿ÉÒÔÓÃSTART WITH...CONNECT BY PRIOR×Ó¾äʵÏֵݹé²éѯ£¬connect by Êǽṹ»¯²éѯÖÐÓõ½µÄ£¬Æä»ù±¾Óï·¨ÊÇ£º
select ... from <TableName>
where <Conditional-1>
start with <Conditional-2>
connect by <Conditional-3>
;
<Conditi ......
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