Mysql 搜索查询计数两个字段，并将结果分组为一行

我有一个表，在其中我想通过orig调用和term调用将其生成一行组。我会数一数它有多少次传入和传出..这是表格

呼叫表

|ID | originating call |   terminating call |  call type    
| 1 | 123              |       123          |  incoming
| 2 | 123              |       123          |  outgoing
| 3 | 123              |       321          |  incoming
| 4 | 123              |       321          |  incoming

结果应该是

 originating call |   terminating call |  incoming  | outgoing
      123         |       123          |     1      |    1
      123         |       321          |     2      |    0

---

我尝试将count（）作为传入，将count（）作为传出，但我不知道下一步该怎么做。我应该按发起呼叫和终止呼叫对其进行分组吗？

这称为条件聚合。您可以使用

case

语句执行基本查询：

select originating, terminating,
       sum(case when calltype = 'incoming' then 1 else 0 end) as incoming,
       sum(case when calltype = 'outgoing' then 1 else 0 end) as outgoing,
from calltable ct
group by originating, terminating;

这在所有数据库中都有效。获取

id

列的步骤因数据库而异。在SQL Server中，您将执行以下操作：

select row_number() over (order by (select NULL)) as id,
       originating, terminating,
       sum(case when calltype = 'incoming' then 1 else 0 end) as incoming,
       sum(case when calltype = 'outgoing' then 1 else 0 end) as outgoing,
from calltable ct
group by originating, terminating;

在MySQL中，您将获得

id

作为：

select @id := @id + 1 as id,
       originating, terminating,
       sum(calltype = 'incoming') as incoming,
       sum(calltype = 'outgoing') as outgoing,
from calltable ct cross join
     (select @id := 0) const
group by originating, terminating;

---

虽然

case

在MySQL中运行良好，但此版本使用了一种在这种情况下非常方便的简写方式。

这称为条件聚合。您可以使用

case

语句执行基本查询：

select originating, terminating,
       sum(case when calltype = 'incoming' then 1 else 0 end) as incoming,
       sum(case when calltype = 'outgoing' then 1 else 0 end) as outgoing,
from calltable ct
group by originating, terminating;

这适用于所有数据库。获取

id

列的步骤因数据库而异。在SQL Server中，您将执行以下操作：

select row_number() over (order by (select NULL)) as id,
       originating, terminating,
       sum(case when calltype = 'incoming' then 1 else 0 end) as incoming,
       sum(case when calltype = 'outgoing' then 1 else 0 end) as outgoing,
from calltable ct
group by originating, terminating;

在MySQL中，您将获得

id

作为：

select @id := @id + 1 as id,
       originating, terminating,
       sum(calltype = 'incoming') as incoming,
       sum(calltype = 'outgoing') as outgoing,
from calltable ct cross join
     (select @id := 0) const
group by originating, terminating;

虽然

case

在MySQL中运行良好，但此版本使用了一种在这种情况下非常方便的速记方式。

使用以下查询：

select originating, terminating,
       sum(case when calltype ='incoming' then 1 else 0 end) as incoming,
       sum(case when calltype ='outgoing' then 1 else 0 end) as outgoing,
from Table_Name

按起始、终止分组

使用以下查询：

select originating, terminating,
       sum(case when calltype ='incoming' then 1 else 0 end) as incoming,
       sum(case when calltype ='outgoing' then 1 else 0 end) as outgoing,
from Table_Name

---

按起始、终止分组

这是SQL Server还是MySQL？您真正使用的是哪个数据库？您使用的是什么：

MySQL

或

sqlserver

？是否有

调用类型

其他显示的两个值？@PM77-1对不起，我使用了mysql。这是SQL Server还是mysql？您真正使用的是哪个数据库？您使用的是什么：

MySQL

或

sqlserver

？是否有

调用类型

显示的两个值不同？@PM77-1抱歉，我使用了mysql。它不应该是count而不是sum吗？我想我明白了，为什么要使用sum（），因为返回值为1或0？我说得对吗？@Vincent-你明白了。它不应该是count而不是sum吗？我想我明白了为什么你使用sum（）因为返回值是1还是0？“我说得对吗？”文森特-你说得对。