SELECT TIME(NOW());	-- 15:23:07SELECT CURTIME(NOW());-- 15:23:07SELECT ABS(-4); -- 4SELECT 5 MOD 3; -- 2SELECT CURDATE(); -- 2014-08-25SELECT ADDDATE(CURDATE(), 1); -- 2014-08-26SELECT DATE_ADD(CURDATE(),INTERVAL 1 DAY); -- 2014-08-26SELECT DATEDIFF(‘2014-08-25‘, ‘2014-08-20‘); -- 5SELECT DATE_FORMAT(NOW(), ‘%Y%m%d%H%i%s‘); -- 20140825152912