mysql> select now();
输出
2019-07-26 15:43:34
例子
mysql> select now(), sleep(3), now(); +---------------------+----------+---------------------+ | now() | sleep(3) | now() | +---------------------+----------+---------------------+ | 2008-08-08 22:28:21 | 0 | 2008-08-08 22:28:21 | +---------------------+----------+---------------------+
参考：
https://www.cnblogs.com/php12-cn/p/8882221.html
原文：https://www.cnblogs.com/sea-stream/p/11253515.html