mysql - 我想要像 sum() 这样的函数在 mysql 中添加数据类型时间列中的所有行

Question

在我的数据库中有如下表格

+----+-----------+----------+
| id | fk_id     | duration |
+----+-----------+----------+
|  1 |        23 | 00:00:31 |
|  2 |        23 | 00:00:36 |
|  3 |       677 | 00:00:36 |
|  4 |       678 | 00:00:36 |
+----+-----------+----------+

在上表中，持续时间列的数据类型为时间。

下面是那个表的schema

Create Table: CREATE TABLE `durationof` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `fk_id` int(11) NOT NULL,
  `duration` time NOT NULL,
  PRIMARY KEY (`id`))

我只想在查询的持续时间列中添加所有时间，我该怎么做？

就像求和函数一样，有没有把所有mysql时间值相加的函数。

我尝试从 durationof 中选择 addtime(diration);

但这不起作用。

Answer 1

我完全不同意@Corbin's original answer .如 The TIME Type 下所述:

TIME values may range from '-838:59:59' to '838:59:59'. The hours part may be so large because the TIME type can be used not only to represent a time of day (which must be less than 24 hours), but also elapsed time or a time interval between two events (which may be much greater than 24 hours, or even negative).

对所有此类区间求和:convert to seconds , take the sum然后 convert back again .

SELECT SEC_TO_TIME(SUM(TIME_TO_SEC(duration))) FROM durationof

查看sqlfiddle .