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   from TB_DOC_MODCONTENT A WHERE
   (RELEASE_DATE>=trunc(cast('2009-8-28 21:26:16' as date),'DD') AND RELEASE_DATE<trunc(cast('2009-8-28 21:26:16' as date)+1,'DD'))
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TRUNC£¨TO_DATE(’24-Nov-1999 08:00 pm’,’dd-mon-yyyy hh:mi am’)£©
=’24-Nov-1999 12:00:00 am’
TRUNC£¨TO_DATE(’24-Nov-1999 08:37 pm’,’dd-mon-yyyy hh:mi am’,’hh’)£© =’24-Nov-1999 08:00:00 am’
 
round (date,''format'')δָ¶¨formatʱ£¬Èç¹ûÈÕÆÚÖеÄʱ¼äÔÚÖÐÎç֮ǰ£¬Ôò½«ÈÕÆÚÖеÄʱ¼ä½Ø¶ÏΪ12 A.M.(ÎçÒ¹,Ò»ÌìµÄ¿ªÊ¼),·ñÔò½øµ½µÚ¶þÌì¡£
 
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2.TRUNC(for number)
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