MySQL 如何基于秒数计算时间

首先，让我们创建一个表 –

mysql> create table DemoTable
(
   Logouttime time
);
Query OK, 0 rows affected (0.62 sec)

使用insert命令向表中插入一些记录 –

mysql> insert into DemoTable values('5:50:00');
Query OK, 1 row affected (0.15 sec)
mysql> insert into DemoTable values('6:10:10');
Query OK, 1 row affected (0.17 sec)
mysql> insert into DemoTable values('8:00:50');
Query OK, 1 row affected (0.14 sec)

使用select语句显示表中的所有记录 –

mysql> select *from DemoTable;

这将产生以下输出 –

+------------+
| Logouttime |
+------------+
| 05:50:00   |
| 06:10:10   |
| 08:00:50   |
+------------+
3 rows in set (0.00 sec)

下面是在MySQL中基于秒计算时间的查询 –

mysql> select sec_to_time(sum(time_to_sec(Logouttime))) from DemoTable;

这将产生以下输出 –

+-------------------------------------------+
| sec_to_time(sum(time_to_sec(Logouttime))) |
+-------------------------------------------+
| 20:01:00                                  |
+-------------------------------------------+
1 row in set (0.80 sec)

阅读更多：MySQL 教程