我需要帮助,我需要计算当前的事件调用数。这是我的 table :
+---------------------+---------+
| calldate | billsec |
+---------------------+---------+
| 2013-05-14 09:40:30 | 29 |
| 2013-05-14 09:40:31 | 24 |
| 2013-05-14 09:40:31 | 30 |
| 2013-05-14 09:40:33 | 20 |
| 2013-05-14 09:40:34 | 21 |
| 2013-05-14 09:40:35 | 30 |
| 2013-05-14 09:40:36 | 30 |
| 2013-05-14 09:40:37 | 30 |
| 2013-05-14 09:40:37 | 25 |
| 2013-05-14 09:40:39 | 22 |
| 2013-05-14 09:40:39 | 19 |
| 2013-05-14 09:40:40 | 22 |
| 2013-05-14 09:40:41 | 22 |
例如,如果我想计算“2013-05-14 09:40:34”内的事件调用数,我应该获得 5 条记录,因为例如,第一行调用位于“2013-05”之间-14 09:40:30' 和 '2013-05-14 09:40:59' (calldate+billsec)。
谢谢
最佳答案
select count(*) from calls
where '2013-05-14 09:40:34' between
calldate and DATE_ADD(calldate,INTERVAL billsec SECOND)
更新:
为了查看每个调用日期的金额,您可以使用子查询
select B.calldate
,(select count(*) from calls A
where B.calldate between
A.calldate and DATE_ADD(A.calldate,INTERVAL A.billsec SECOND)) numcalls
from calls B
group by B.calldate
关于php - MySql查询计算瞬间峰值数量,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/17465016/