SELECT * FROM table
WHERE exec_datetime BETWEEN DATE_SUB(NOW(), INTERVAL 30 DAY) AND NOW();
http:// dev .mysql.com / doc / refman / 5.5 / en / date-and-time-functions.html#function_date-add
SELECT * FROM table
WHERE exec_datetime BETWEEN DATE_SUB(NOW(), INTERVAL 30 DAY) AND NOW();
http:// dev .mysql.com / doc / refman / 5.5 / en / date-and-time-functions.html#function_date-add