在PHP中添加时间并获得平均值

我的数据库中有这个表

+--------- --------- ------------+
|   id    |   time  |    date    |
+--------- --------- ------------+
|    1    |   0:12  | 03/30/2014 |
 --------- --------- ------------
|    2    |   0:14  | 04/09/2014 | <-- date today
 --------- --------- ------------
|    3    |   0:32  | 04/09/2014 | <-- date today
 --------- --------- ------------
|    4    |   0:24  | 04/09/2014 | <-- date today
 --------- --------- ------------

今天的总时间=1:10

Average = 1:10 / 3

---

MySQL解决方案：

select 
    avg( str_to_date( time, '%i:%s' ) ) 'avg t in sec', 
    date(date) date
from entries 
group by 2;

mysql> select
    ->   sum( str_to_date( time, '%i:%s' ) ) t,
    ->   date
    -> from entries
    -> group by 2;
+------+---------------------+
| t    | date                |
+------+---------------------+
|   12 | 2014-03-30 00:00:00 |
|   70 | 2014-04-09 00:00:00 |
+------+---------------------+
2 rows in set (0.00 sec)

mysql> select
    ->     avg( str_to_date( time, '%i:%s' ) ) 'avg t in sec',
    ->     date(date) date
    -> from entries
    -> group by 2;
+--------------+------------+
| avg t in sec | date       |
+--------------+------------+
|      12.0000 | 2014-03-30 |
|      23.3333 | 2014-04-09 |
+--------------+------------+
2 rows in set (0.00 sec)

演示@

在我的控制台上观察到的结果：

select 
    avg( str_to_date( time, '%i:%s' ) ) 'avg t in sec', 
    date(date) date
from entries 
group by 2;

mysql> select
    ->   sum( str_to_date( time, '%i:%s' ) ) t,
    ->   date
    -> from entries
    -> group by 2;
+------+---------------------+
| t    | date                |
+------+---------------------+
|   12 | 2014-03-30 00:00:00 |
|   70 | 2014-04-09 00:00:00 |
+------+---------------------+
2 rows in set (0.00 sec)

mysql> select
    ->     avg( str_to_date( time, '%i:%s' ) ) 'avg t in sec',
    ->     date(date) date
    -> from entries
    -> group by 2;
+--------------+------------+
| avg t in sec | date       |
+--------------+------------+
|      12.0000 | 2014-03-30 |
|      23.3333 | 2014-04-09 |
+--------------+------------+
2 rows in set (0.00 sec)

---

你能从数据库中获取时间吗？@poomrokcthe3年我可以通过使用mysql_fetch_array获取时间你说的“平均秒数”是什么意思？@PorkChop尝试将所有这些复制到mysql查询中，这可能是我没有的特殊sql命令know@PorkChop：检查我的更新答案。当您将时间相加时，总计为

1:10

表示

1分10秒

，等于

70秒

。当你平均它时，它返回

秒

@Ravinder OK。我现在明白了，但是如何通过php代码运行此查询呢？：）@PorkChop：将我的示例中显示的

avg

查询与PHP一起使用并执行。如果需要，您还可以将别名

'avg t in sec'

更改为

'avg_time'