declare @start datetime;
set @start = '2013/07/01';
SELECT a.XingMing,b.YiYuanMC,a.RiQi FROM data_XiBaoZLSQB as a LEFT JOIN BaseInfo_YiYuanXXB as b ON a.YiYuanMC_id=b.YiYuanBH WHERE datediff(d,@start,a.RiQi)>=0
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