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 1. round(Num,n) :  ËÄÉáÎåÈëÊý×ÖNum£¬±£ÁônλСÊý£¬²»Ð´NĬÈϲ»ÒªÐ¡Êý£¬ËÄÉáÎåÈëµ½ÕûÊý¸öλ
 select ROUND(21.237,2) from dual; 
 ½á¹û£º 21.24
 2. trunc(Num,n) : ½ØÈ¡Êý×ÖNum£¬±£ÁônλСÊý£¬²»Ð´NĬÈÏÊÇ0£¬¼´²»ÒªÐ¡Êý
 select TRUNC(21.237,2) from dual;
 ½á¹û£º21.23
 3.MOD(m,n) £º ·µ»Øm³ýÒÔnµÄÓàÊý


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oracle ÅÅÐòÄÚ´æ

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Oracle ÅúÁ¿µ¼ÈëSequence

 select 'create sequence '||sequence_name||  
       ' minvalue '||min_value||  
       ' maxvalue '||max_value||  
       ' start with '||last_number||  
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