Question

我需要帮助，我需要计算当前活动呼叫的数量。这是我的表：

+---------------------+---------+
| 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'中的活动呼叫数，我应该得到5条记录，因为例如，第一行呼叫是在'2013-05之间-14 09:40:30'和'2013-05-14 09:40:59'（calldate + billsec）。

由于

Answer 1

select count(*) from calls 
where '2013-05-14 09:40:34' between
  calldate and DATE_ADD(calldate,INTERVAL billsec SECOND)

SQLFIDDLE

<强>更新
为了查看每个calldate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

SQLFIDDLE

MySql查询以计算当前峰值的数量

1 个答案: