Question

我有两个查询需要在一个查询上：

SELECT call_queues.queue_alias, count(users.*) as free
       FROM call_queues
       INNER JOIN call_queues_users ON call_queues.id = call_queues_users.call_queue_id
       INNER JOIN users ON call_queues_users.user_id = users.id
       WHERE users.phone_status_id = 0
         AND users.status_id = 1
       GROUP BY call_queues.queue_alias

该查询返回如下内容：

     queue_alias     | free 
---------------------+---------------
 Teste Rodolfo       |             1
 Teste Diego         |             1
 Desenvolvimento     |             1
 Suporte Emergencial |             1
 Gestores            |             1

还有一个：

SELECT call_queues.queue_alias, count(users.*) as disconnected
FROM call_queues
INNER JOIN call_queues_users ON call_queues.id = call_queues_users.call_queue_id
INNER JOIN users ON call_queues_users.user_id = users.id
WHERE users.phone_status_id = 4
  AND users.status_id <> 2
GROUP BY call_queues.queue_alias

返回：

     queue_alias      | disconnected 
----------------------+--------------
 Comercial Emergencia |            1
 Comercial            |            1
 Comunicação          |            1
 Testes Flawbson      |            1

当我在一个选择中加入这两个查询时：

SELECT
  ( SELECT COUNT(users.*)
   FROM call_queues
   INNER JOIN call_queues_users ON call_queues.id = call_queues_users.call_queue_id
   INNER JOIN users ON call_queues_users.user_id = users.id
   WHERE users.phone_status_id = 0
     AND users.status_id = 1
   GROUP BY call_queues.queue_alias) AS free,

  (SELECT count(users.*)
   FROM call_queues
   INNER JOIN call_queues_users ON call_queues.id = call_queues_users.call_queue_id
   INNER JOIN users ON call_queues_users.user_id = users.id
   WHERE users.phone_status_id = 4
     AND users.status_id <> 2
   GROUP BY call_queues.queue_alias) AS disconnected;

我在标题中收到了错误消息。

我认为问题是查询返回不同的行数。

查询结果应为：

     queue_alias      | disconnected | free
----------------------+--------------+---------
 Comercial Emergencia |            1 |       0
 Comercial            |            1 |       0
 Comunicação          |            1 |       0
 Testes Flawbson      |            1 |       0
 Teste Rodolfo        |            0 |       1
 Teste Diego          |            0 |       1
 Desenvolvimento      |            0 |       1
 Suporte Emergencial  |            0 |       1
 Gestores             |            0 |       1

那么，如果错误信息与我的想法无关，我如何在db中执行上述结果？

Answer 1

您的查询不起作用，因为子查询中有group by。因此，在许多情况下，子查询将返回多行。

相反，使用条件聚合：

SELECT q.queue_alias,
       SUM(CASE WHEN u.phone_status_id = 0 AND u.status_id = 1 THEN 1 ELSE 0 END) as free,
       SUM(CASE WHEN u.phone_status_id = 4 AND u.status_id <> 2 THEN 1 ELSE 0 END) as disconnected
FROM call_queues q INNER JOIN
     call_queues_users qu
     ON q.id = qu.call_queue_id INNER JOIN
     users u
     ON cq.user_id = users.id
GROUP BY q.queue_alias;

错误：用作表达式的子查询返回的多行

1 个答案: