SELECT * FROM table
WHERE exec_datetime BETWEEN DATE_SUB(Now(), INTERVAL 30 DAY) AND Now();
http://dev.mysql.com/doc/refman/5.5/zh-CN/date-and-time- functions.html#function_date-add
如何从mysql中的当前日期时间中减去30天?
SELECT * FROM table
WHERE exec_datetime BETWEEN DATE_SUB(Now(), INTERVAL 30 DAY) AND Now();
http://dev.mysql.com/doc/refman/5.5/zh-CN/date-and-time- functions.html#function_date-add