查询一天：select * from table where to_days(column_time) = to_days(now());select * from table where date(column_time) = curdate();查询一周：select * from table where DATE_SUB(CURDATE(), INTERVAL 7 DAY) <= date(column_time);查询一个月：select * from table where DATE_SUB(CURDATE(), INTERVAL 1 MONTH) <= date(column_time);查询指定天数select * from table where DATE_SUB(CURDATE(), INTERVAL 2 DAY) <= date(column_time);