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/* ¶¨Ò忪ʼÈÕÆÚºÍ½áÊøÈÕÆÚ*/
declare @date_a datetime,@date_b datetime
set @date_a='2009-2-10'
set @date_b='2009-2-12'
/* ÔÚÈÕÆÚdate_a(°üº¬) ºÍdate_b(²»°üº¬) Ö®¼ä*/
select * from ut_article where createtime between @date_a and @date_b
/* ÔÚÈÕÆÚdate_a(²»°üº¬) ºÍdate_b(°üº¬) Ö®¼ä*/
select * from ut_article where datediff(d,@date_a,createtime)>0 and datediff(d,@date_b,createtime)<=0
/* ÔÚÈÕÆÚdate_a(²»°üº¬) ºÍdate_b(²»°üº¬) Ö®¼ä*/
select * from ut_article where datediff(d,@date_a,createtime)>0 and datediff(d,@date_b,createtime)<0
/* ÔÚÈÕÆÚdate_a(°üº¬) ºÍdate_b(°üº¬) Ö®¼ä*/
select * from ut_article where datediff(d,@date_a,createtime)>=0 and datediff(d,@date_b,createtime)<=0


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