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oracle trunc()º¯ÊýµÄÓ÷¨
1.TRUNC(for dates)
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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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TRUNC£¨number[,decimals]£©
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TRUNC£¨89.985£©=89
TRUNC£¨89.985£¬-1£©=80
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{
formatΪdayʱ,Ö»¾«È·µ½Ìì,¶ø²»¹Ü¼¸Ä꼸ÔÂÖ»ÒªÊÇ·ûºÏµÄday¾Í¿ÉÒÔÁË,ÒªÏëÈ·¶¨Ò»ÄêÖеÄijÔµÄijһÌì¾ÍÒªÓÃtrunc(date,''dd'').
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}
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