Mysql 如何将2个数据库结果合并到一列中

我有以下两栏：

A  |  B
---|---
7  |  1
7  |  2
3  |  7
4  |  5
-------

我想得到包含（1,2,3）的1列。

目前我正在查询：

SELECT  `A` ,  `B` 
FROM  `mytable` 
WHERE  `A` =7
OR  `B` =7

但我得到了两列，A和B两边都有数字7

---

我肯定有办法得到我想要的，但我不知道如何用谷歌搜索

不太确定您需要什么，但我猜是这样的：

SELECT A FROM mytable WHERE B=7
UNION
SELECT B FROM mytable WHERE A=7

---

我不确定你需要什么，但我猜是这样的：

SELECT A FROM mytable WHERE B=7
UNION
SELECT B FROM mytable WHERE A=7

你可以用这个：

SELECT
  case when A=7 then B else A end
FROM
  yourtable
WHERE
  7 IN (A, B)

SELECT
  GROUP_CONCAT(case when A=7 then B else A end
               ORDER BY case when A=7 then B else A end)
FROM
  yourtable
WHERE 7 IN (A, B)

如果需要单列，可以使用以下选项：

SELECT
  case when A=7 then B else A end
FROM
  yourtable
WHERE
  7 IN (A, B)

SELECT
  GROUP_CONCAT(case when A=7 then B else A end
               ORDER BY case when A=7 then B else A end)
FROM
  yourtable
WHERE 7 IN (A, B)

看小提琴

如果A和B的值可以同时为7，并且您希望跳过该行，则可以替换为：

WHERE 7 IN (A, B)

与

你可以用这个：

SELECT
  case when A=7 then B else A end
FROM
  yourtable
WHERE
  7 IN (A, B)

SELECT
  GROUP_CONCAT(case when A=7 then B else A end
               ORDER BY case when A=7 then B else A end)
FROM
  yourtable
WHERE 7 IN (A, B)

如果需要单列，可以使用以下选项：

SELECT
  case when A=7 then B else A end
FROM
  yourtable
WHERE
  7 IN (A, B)

SELECT
  GROUP_CONCAT(case when A=7 then B else A end
               ORDER BY case when A=7 then B else A end)
FROM
  yourtable
WHERE 7 IN (A, B)

看小提琴

如果A和B的值可以同时为7，并且您希望跳过该行，则可以替换为：

WHERE 7 IN (A, B)

与

试试这个

SELECT A as Single FROM mytable WHERE B=7   UNION   
SELECT B  as Single FROM mytable WHERE A=7 ORDER BY Single;

试试这个

SELECT A as Single FROM mytable WHERE B=7   UNION   
SELECT B  as Single FROM mytable WHERE A=7 ORDER BY Single;

---

如果您期望结果为1、2、3，请使用下面的选项

SELECT colB as NewCol FROM tableName WHERE colA=7
UNION
SELECT colA as NewCol FROM tableName WHERE colB=7;

如果您想要两个列，只需使用

SELECT colA, colB FROM tableName WHERE colA=7 OR colB=7;

---

如果您期望结果为1、2、3，请使用下面的选项

SELECT colB as NewCol FROM tableName WHERE colA=7
UNION
SELECT colA as NewCol FROM tableName WHERE colB=7;

如果您想要两个列，只需使用

SELECT colA, colB FROM tableName WHERE colA=7 OR colB=7;

---

我想你在找这个

   SELECT myresult from (

          SELECT A myresult FROM Table1 WHERE A IN (1,2,3)
          UNION
          SELECT B myresult FROM Table1 WHERE B IN (1,2,3)
                   )t
   ORDER BY myresult

这将产生：

 MYRESULT
   1
   2
   3

---

我想你在找这个

   SELECT myresult from (

          SELECT A myresult FROM Table1 WHERE A IN (1,2,3)
          UNION
          SELECT B myresult FROM Table1 WHERE B IN (1,2,3)
                   )t
   ORDER BY myresult

这将产生：

 MYRESULT
   1
   2
   3

---

您必须尝试此代码

SELECT b as value FROM users WHERE a='7'
UNION All
SELECT a as value FROM users WHERE b='7'

---

此查询必须对您有所帮助。

您必须尝试此代码

SELECT b as value FROM users WHERE a='7'
UNION All
SELECT a as value FROM users WHERE b='7'

---

此查询必须对您有所帮助。

您期望的输出是什么？您期望的输出是什么？非常感谢您这正是我想要的，我不知道MySQL上有UNION：P@MahmoudZalt：如果这解决了您的问题，请将其标记为已接受。看，非常感谢这正是我想要的，我不知道MySQL上有联盟：P@MahmoudZalt：如果这解决了您的问题，请将其标记为已接受。看见