NOW(),SYSDATE(),CURRENT_TIMESTAMP(),LOCALTIME():获取系统当前日期和时间
SELECT NOW() SELECT SYSDATE() SELECT CURRENT_TIMESTAMP() SELECT CURRENT_TIMESTAMP SELECT LOCALTIME() SELECT LOCALTIME
-> 2016-01-16 17:44:41 -> 2016-01-16 17:44:41 -> 2016-01-16 17:44:41 -> 2016-01-16 17:44:41 -> 2016-01-16 17:44:41 -> 2016-01-16 17:44:41