Question

您好我正在寻求我的查询帮助，该查询当前运行时没有错误但不显示数据，因为我也需要它。我的表存储了电话号码，相关字段是id，phonetype和phonenumber。

运行时，它会按预期返回id，HOME PHONE，WORK PHONE，CELL PHONE列，但它仅显示最后一个数字。假设在给定行中有家庭电话和工作电话号码...我只在工作电话列中获取该ID的数据。如果连续有家庭电话，工作电话和手机......我只能在手机电话栏中获取数据。

我需要通过phonetype在唯一列中为给定id的所有phonenumbers排一行。我希望这是有道理的，如果不是查询应该让你知道我在寻找什么...谢谢

SELECT id,
(IF(phonetype = 'HOME PHONE', phonenumbers.phonenumber, '')) AS 'HOME PHONE',
(IF(phonetype = 'WORK PHONE', phonenumbers.phonenumber, '')) AS 'WORK PHONE',
(IF(phonetype = 'CELL PHONE', phonenumbers.phonenumber, '')) AS 'CELL PHONE'
FROM phonenumbers
GROUP BY id;

我正在查询的表格看起来像这样

id | name | phonetype | phonenumber

1  |  Jim  |  HOME PHONE | 0000000001        
1  |  Jim  |  WORK PHONE | 0000000002
2  |  Kim  |  HOME PHONE | 0000000003
2  |  Kim  |  WORK PHONE | 0000000004
2  |  Kim  |  CELL PHONE | 0000000005

我正在寻找的结果看起来像这样......

id | name | home phone | work phone | cell phone

 1 | Jim | 0000000001 | 0000000002 | 
 2 | Kim | 0000000003 | 0000000004 | 0000000005

Answer 1

假设每个ID只有一个针对它的电话号码：

SELECT a.id,
(SELECT phonenumbers.phonenumber FROM phonenumbers WHERE phonetype = 'HOME PHONE' AND id = a.id) AS 'HOME PHONE',
(SELECT phonenumbers.phonenumber FROM phonenumbers WHERE phonetype = 'WORK PHONE' AND id = a.id)  AS 'WORK PHONE',
(SELECT phonenumbers.phonenumber FROM phonenumbers WHERE phonetype = 'CELL PHONE' AND id = a.id)  AS 'CELL PHONE'
FROM phonenumbers a
GROUP BY a.id;

可能有帮助。欢呼声。

将IF行选择为多列

1 个答案: