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--A. ÔµĵÚÒ»Ìì
SELECT CONVERT(datetime,CONVERT(char(8),@dt,120)+'1')

--B. ÔµÄ×îºóÒ»Ìì
SELECT DATEADD(Day,-1,CONVERT(char(8),DATEADD(Month,1,@dt),120)+'1')



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SQL code--A. ÔµĵÚÒ»ÌìSELECTCONVERT(datetime,CONVERT(char(8),@dt,120)+'1')--B. ÔµÄ×îºóÒ»ÌìSELECTDATEADD(Day,-1,CONVERT(char(8),DATEADD(Month,1,@dt),120)+'1')


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set @s='2009-05-


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