如何在mysql中将多列值组合为单列

Question

您好，我喜欢多列，

Address1, Address2

value1,   value2

我在地址中需要这个单列名称，如下所示

Address

value1
value2

如何使用mysql查询执行此操作？

请有人帮助我......

Answer 1

您可以对这两列中的UNION进行操作，将它们放入一列中：

SELECT Address1 AS Address
FROM yourTable
UNION ALL
SELECT Address2 AS Address
FROM yourTable

Answer 2

您可以使用Union，例如

Select Address1 as Address 
FROM Table 
UNION 
Select Address2 
FROM Table