form.submit(function() {})
SELECT date_fluing, SUM(num_psng) FROM ... GROUP BY date_fluing
SELECT DATE_FORMAT(date_fluing, '%Y-%m'), SUM(num_psng) FROM ... GROUP BY DATE_FORMAT(date_fluing, '%Y-%m')
SELECT SUM(num_psng) FROM ... WHERE DATE_FORMAT(date_fluing, '%Y-%m') = '2017-05'
ALTER TABLE `user` ALTER COLUMN `name` SET DEFAULT ''