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SELECT * FROM table WHERE DATEDIFF(DAY,create_time,GETDATE())=0 -------今天
SELECT * FROM table WHERE DATEDIFF(DAY,create_time,GETDATE())=1 -------昨天
SELECT * FROM table WHERE datediff(wk,create_time,getdate())=1 -------上周
SELECT * FROM table WHERE datediff(wk,create_time,getdate())>1 ------更早