SELECT * FROM 表名 WHERE DATEDIFF(字段,NOW())=0
select * from 表名 where to_days(时间字段名) = to_days(now());
SELECT * FROM 表名WHERE DATEDIFF(字段,NOW())=n
SELECT * FROM 表名 where DATE_SUB(CURDATE(), INTERVAL n DAY) <= date(时间字段名)
SELECT * FROM 表名 WHERE DATE_FORMAT( 时间字段名, '%Y%m' ) = DATE_FORMAT( CURDATE( ) , '%Y%m' )