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OracleÖеÄdecodeÓ÷¨
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select t.res_id,
       t.res_size || '(kb)' as res_size,
       decode(t.res_type,1,'Ä£°åÇø','0','ÎĵµÇø') res_type,
       t.res_address,
       t.createtime,
       t.createuser
  from t_cms_d_resource t


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Oracle ¿Í»§¶ËÅäÖüàÌý(TNSNames.oraÉèÖÃ)

¢Ù Ö»ÐèÔÚÎļþ TNSNames.ora ÖмÓÈëÒÔϽڵ㣬¼´¿É³É¹¦ÅäÖüàÌý
ORCL190 =  //ºìÉ«²¿ÃÅΪÁ¬½Ó¼àÌýÃû×Ö
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.190)(PORT = 1521))  //ºìÉ«²¿ÃÅΪ·þÎñÆ÷ËùÔÚIPµØÖ· 1521Ϊ¶Ë¿ÚºÅ
    (CONNECT_DATA ......

OracleÎÂϰÓëÈëÃÅ

SQL Server¿ª·¢ÕßOracle¿ìËÙÈëÃÅ http://kb.cnblogs.com/a/853694 ¼òµ¥¸ÅÄîµÄ½éÉÜ 1. Á¬½ÓÊý¾Ý¿â
S:    use mydatabase
O:    connect username/password@DBAlias
       conn username/password@DBAlias 2. ÔÚOracleÖÐʹÓÃDual, DualÊÇO ......

oracle sqlÓï¾äÓÅ»¯»ù´¡

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²»ÓÃNOT IN²Ù×÷·û£¬¿ÉÒÔÓÃNOT EXISTS»òÕßÍâÁ¬½Ó+Ìæ´ú¡£
OracleÔÚÖ´ÐÐIN×Ó²éѯʱ£¬Ê×ÏÈÖ´ÐÐ×Ó²éѯ£¬½«²éѯ½á¹û·ÅÈëÁÙʱ±íÔÙÖ´ÐÐÖ÷²éѯ¡£¶øEXISTÔòÊÇÊ×Ïȼì²éÖ÷²éѯ£¬È»ºóÔËÐÐ×Ó²éѯֱµ½ÕÒµ½µÚÒ»¸öÆ¥ÅäÏî¡£NOT EXISTS±ÈNOT INЧÂÊÉԸߡ£µ«¾ßÌåÔÚÑ¡ÔñIN»òEXIST² ......

OracleÖеÄUnion¡¢Union All¡¢Intersect¡¢Minus

ÖÚËùÖÜÖªµÄ¼¸¸ö½á¹û¼¯¼¯ºÏ²Ù×÷ÃüÁ½ñÌìÏêϸµØ²âÊÔÁËһϣ¬·¢ÏÖһЩÎÊÌ⣬¼Ç¼±¸¿¼¡£
¡¡¡¡¼ÙÉèÎÒÃÇÓÐÒ»¸ö±íStudent£¬°üÀ¨ÒÔÏÂ×Ö¶ÎÓëÊý¾Ý£º
¡¡¡¡drop table student;
¡¡¡¡create table student
¡¡¡¡(
¡¡¡¡id int primary key,
¡¡¡¡name nvarchar2(50) not null,
¡¡¡¡score number not null
¡¡¡¡);
¡¡¡¡insert into ......

ORACLEµÄALL_VIEWSÊý¾Ý×Öµätext×Ö¶ÎlongÀàÐÍÎÊÌâ

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etl@DWTEST> select owner,view_name from all_views where instr(text,'lrf') > 0;
select owner,view_name from all_views where instr(text,'lrf') > 0
             ......
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