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我正在尝试总结查询的输出，但正在苦苦挣扎。下面的查询检查了fax_authorized 表，并根据它们生成带有电子邮件地址的扩展摘要。

我有以下查询：

SELECT extended_number, IF(COUNT(extension_id)<5,1,0) AS 'fax5', 
  IF(COUNT(extension_id)>5 AND COUNT(extension_id)<11,1,0) AS 'fax10',
  IF(COUNT(extension_id)>10,1,0) AS 'fax10+', COUNT(extension_id) AS 'fax_total'
FROM fax_authorized fa, extension e
WHERE fa.extension_id = e.id
GROUP BY extended_number;

输出如下所示：

+-----------------+------+-------+--------+-----------+
| extended_number | fax5 | fax10 | fax10+ | fax_total |
+-----------------+------+-------+--------+-----------+
| 0009*004        |    1 |     0 |      0 |         1 |
| 0139*601        |    0 |     1 |      0 |         6 |
| 0139*743        |    1 |     0 |      0 |         2 |
| 0139*996        |    1 |     0 |      0 |         1 |
+-----------------+------+-------+--------+-----------+

我想要的是根据 LEFT(extended_number,4) 总结这些数据，例如上面的 0139 将具有传真 5 = 2、传真 10 = 1、传真总计 = 9。

我试过这个，它不起作用：

SELECT extended_number, SUM(IF(COUNT(extension_id)<5,1,0)) AS 'fax5',   
  SUM(IF(COUNT(extension_id)>5 AND COUNT(extension_id)<11,1,0)) AS 'fax10', 
  SUM(IF(COUNT(extension_id)>10,1,0)) AS 'fax10+', 
  COUNT(LEFT(extension_id,4)) AS 'fax_total'
FROM fax_authorized fa, extension e
WHERE fa.extension_id = e.id
GROUP BY LEFT(extended_number,4);

编辑：我使用下面的 Saharsh Shah 的答案来解决这个问题，但遇到了另一个我认为值得添加的问题。我试图从他的嵌套子查询解决方案创建一个视图，但无法创建，因为视图中不允许子查询。所以我创建了两个相关的视图如下：

CREATE VIEW vw_xoom_faxdetail AS 
  SELECT LEFT(extended_number,4) client_id, 
   IF(COUNT(extension_id)<5,1,0) AS 'fax5', 
   IF(COUNT(extension_id)>5 AND COUNT(extension_id)<11,1,0) AS 'fax10',
   IF(COUNT(extension_id)>10,1,0) AS 'fax10plus', 
   COUNT(extension_id) AS 'fax_total'
 FROM fax_authorized fa, extension e WHERE fa.extension_id = e.id
 GROUP BY client_id;

CREATE VIEW vw_xoom_fax AS 
 SELECT client_id, SUM(fax5) fax5, SUM(fax10) fax10,
  SUM(fax10plus) 'fax10+', SUM(fax_total) fax_total 
 FROM vw_xoom_faxdetail
 GROUP BY client_id;
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1 回答 1

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试试这个：

SELECT extended_number, SUM(fax5) fax5, SUM(fax10) fax10, SUM(fax10plus) 'fax10+', SUM(fax_total) fax_total 
FROM (SELECT LEFT(extended_number,4) extended_number, IF(COUNT(extension_id)<5,1,0) AS 'fax5', 
             IF(COUNT(extension_id)>5 AND COUNT(extension_id)<11,1,0) AS 'fax10',
       IF(COUNT(extension_id)>10,1,0) AS 'fax10plus', COUNT(extension_id) AS 'fax_total'
      FROM fax_authorized fa, extension e WHERE fa.extension_id = e.id
      GROUP BY extended_number) AS A 
GROUP BY extended_number;
于 2012-12-06T12:41:16.040 回答