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2. ²é¿´Oracle´´½¨¹ýÄÄЩ±í¿Õ¼ä£¬±í¿Õ¼äµÄÃû×ֺʹóС
   >select t.tablespace_name, round(sum(bytes/(1024*1024)),0) ts_size
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    wher ......

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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)
----------- ------------- -------------- ----- ......

oracleÐÐתÁÐ

select i.sid,i.sname,i.birthday,i.schooltime,i.sphone,c.classname,a.assnname,sum(decode(subject,'ÓïÎÄ',s.score,0)) as chin,
                              ......

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