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select i.sid,i.sname,i.birthday,i.schooltime,i.sphone,c.classname,a.assnname,sum(decode(subject,'ÓïÎÄ',s.score,0)) as chin,
                                    sum(decode(subject,'Êýѧ',s.score,0)) as math,
                                    sum(decode(subject,'Ó¢Óï',s.score,0)) as eng from student_info i
left join student_expand e on i.sid = e.sid left join student_class c on
        c.classid = e.classid left join student_assn a on a.assnid = e.assnid left join student_score s on s.sid = i.sid
group by i.sid,i.sname,i.birthday,i.schooltime,i.sphone,c.classname,a.assnname;
ÐÐתÁÐ:
decode(subject,'Êýѧ',s.score,0) Ó÷¨:Èç¹ûsubject»áµÈÓÚÊýѧ ,Ôò×îºóÖµµÈÓÚ s.score ·ñÔòÖµµÈÓÚ: 0
 


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Ãâ°²×°Oracle¿Í»§¶ËÈí¼þ ʹÓÃpl/sqlÅäÖõǽ

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1.ÏÂÔØOracle Client Package
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http://www.oracle.com/technology/software/tech/oci/instantclient/htdocs/winsoft.html
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Instant
Client Package – Basic
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required to run OCI, OCCI, and JDBC-OC ......

110¸öOracle ³£Óú¯ÊýµÄ×ܽá3

80¡£LAST
¹¦ÄÜÃèÊö£º´ÓDENSE_RANK·µ»ØµÄ¼¯ºÏÖÐÈ¡³öÅÅÔÚ×îºóÃæµÄÒ»¸öÖµµÄÐУ¨¿ÉÄܶàÐУ¬ÒòΪֵ¿ÉÄÜÏàµÈ£©£¬Òò´ËÍêÕûµÄÓï·¨ÐèÒªÔÚ¿ªÊ¼´¦¼ÓÉÏÒ»¸ö¼¯ºÏº¯ÊýÒÔ´ÓÖÐÈ¡³ö¼Ç¼
SAMPLE£ºÏÂÃæÀý×ÓÖÐDENSE_RANK°´²¿ÃÅ·ÖÇø£¬ÔÙ°´Ó¶½ðcommission_pctÅÅÐò£¬FIRSTÈ¡³öÓ¶½ð×îµÍµÄ¶ÔÓ¦µÄËùÓÐÐУ¬È»ºóÇ°ÃæµÄMAXº¯Êý´ÓÕâ¸ö¼¯ºÏÖÐÈ¡³öнˮ×îµ ......

Oracle±í¿Õ¼ä³£ÓòÙ×÷

1. ²é¿´Oracle´´½¨¹ýÄÄЩÓû§
   >select username from all_users;
2. ²é¿´Oracle´´½¨¹ýÄÄЩ±í¿Õ¼ä£¬±í¿Õ¼äµÄÃû×ֺʹóС
   >select t.tablespace_name, round(sum(bytes/(1024*1024)),0) ts_size
    from dba_tablespaces t, dba_data_files d
    wher ......

Oracle trunc º¯ÊýµÄʹÓÃ

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 select trunc(5.75),trunc(5.75,1),trunc(5.75,-1),trunc(556.234,-2) from dual;
 
 
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TRUNC(5.75) TRUNC(5.75,1) TRUNC(5.75,-1) TRUNC(556.234,-2)
----------- ------------- -------------- ----- ......

oracleÉèÖÃSGA

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sqlplus connect system/orcl as sysdba;
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1.sga_target²»ÄÜ´óÓÚsga_max_size£¬¿ÉÒÔÉèÖÃΪÏàµÈ¡£
2.SGA¼ÓÉÏPGAµÈÆäËû½ø³ÌÕ¼ÓõÄÄÚ´æ×ÜÊý±ØÐëСÓÚ²Ù×÷ϵͳµÄÎïÀíÄÚ´æ¡£
alter system set sga_target=150M scope=spfile;
alter system set sga_max_size=150M scope=spfile;
//Êý¾Ý¿â ......
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