Question

我从一个表中有两个不同的查询，我想将这些查询合并到另一个列

首先查询：

select user_id,meta_value as fee 
FROM magni_usermeta 
WHERE meta_key LIKE 'clinic_%_fee' 
ORDER BY user_id DESC

结果：

  user_id        fee      
*********************
    7          500
    5          450
    5          344
    4          500
    4          700
    2          210
    2          200

第二个查询：

select user_id,meta_value as clinic 
FROM magni_usermeta 
WHERE meta_key LIKE 'clinic_%_clinic_name' 
ORDER BY user_id DESC

结果：

     user_id      clinic
    *********************
        7          99
        5          90
        5          99
        4          99
        4          92
        2          91
        2          90

我想要一个可以提供类似内容的查询：

   user_id        fee           clinic
    **********************************
        7          500             99
        5          450             90
        5          344             99
        4          500             99
        4          700             92
        2          210             91
        2          200             90

我试过这个但是没有得到我想要的确切结果：

select user_id,meta_value as clinic 
FROM magni_usermeta 
WHERE meta_key LIKE 'clinic_%_clinic_name' 
UNION select user_id,meta_value as fee 
FROM magni_usermeta 
WHERE meta_key LIKE 'clinic_%_fee' 
ORDER BY user_id DESC

Answer 1

您可以使用分组

select
  A.user_id,
  group_concat( case when A.tableName = 'fee' then A.meta_value end) as fee,
  group_concat( case when A.tableName = 'clinic' then A.meta_value end) as clinic
from (
  select user_id,meta_value as meta_value, 'fee' as tableName FROM magni_usermeta WHERE meta_key LIKE 'clinic_%_fee' 

  union

  select user_id,meta_value as meta_value, 'clinic' as tableName FROM magni_usermeta WHERE meta_key LIKE 'clinic_%_clinic_name' 

) as A
group by A.user_id

Answer 2

我们需要加入自己以获得诊所名称：

SELECT um.user_id, um.meta_value AS fee, um2.meta_value AS clinic 
FROM magni_usermeta um 
JOIN magni_usermeta um2 ON um2.meta_key = REPLACE(um.meta_key, '_fee', '_clinic_name') 
WHERE um.meta_key LIKE 'clinics_%_fee' 
ORDER BY um.user_id DESC

Answer 3

试试这个，

SELECT a.user_id, a.meta_value as fee, b.meta_value as clinic
FROM magni_usermeta a
JOIN magni_usermeta b
ON a.user_id = b.user_id
WHERE a.meta_key LIKE  'clinic_%_fee'
  AND b.meta_key LIKE 'clinic_%_clinic_name'
ORDER BY a.user_id;

Answer 4

您需要使用inner join

select a.user_id,a.meta_value as clinic, fee FROM magni_usermeta a Inner Join
 magni_usermeta b
 on a.user_id = b.user_id
 WHERE meta_key LIKE 'clinic_%_clinic_name' 
 ORDER BY user_id DESC

Answer 5

您可以在同一个表上尝试内部联接。我有一个postmetas的例子。示例_wp_attachment_metadata和_wp_attached_file是我的meta_key值。

SELECT
  m1.post_id as 'POST ID',
  m1.meta_id as 'META ID',
  m1.meta_value AS 'meta1', 
  m2.meta_value AS 'meta2'

FROM wp_postmeta m1

INNER JOIN 
  wp_postmeta m2
  ON m1.post_id = m2.post_id

WHERE 
  m1.meta_key = '_wp_attachment_metadata'
    AND
  m2.meta_key = '_wp_attached_file'

Answer 6

try this;
select a.user_id,(select b.meta_value FROM magni_usermeta b WHERE b.meta_key LIKE 'clinic_%_fee' AND b.user_id=a.user_id) as fee,(select c.meta_value FROM magni_usermeta c WHERE c.meta_key LIKE 'clinic_%_clinic_name' AND c.user_id=a.user_id) as clinic from magni_usermeta a GROUP BY a.user_id ORDER BY a.user_id DESC

如何在mysql中从两个不同的子查询创建两列

6 个答案: