如何将多列组合为一并使用自定义字符串格式化?

问题描述

SELECT id, <X> AS name FROM `table`

基本上是
的组合姓氏 + ', ' + 名字

Basically <X> is a combination of
lastname + ', ' + firstname

例子是

   id | name        |
   2  | Smith, Bob  |
   3  | Jones, Susy |

这只是一个例子，我真的不想把名字组合得这么简单.

This is just an example, I don't really want to combine names so simple.

推荐答案

CONCAT() 函数?

SELECT id, CONCAT(lastname, ', ', firstname) AS name FROM `table`;

如果要连接多个字段，还可以考虑 CONCAT_WS() 函数，其中第一个参数是其余参数的分隔符，添加在要连接的字符串之间:

If you are going to concatenate many fields, you could also consider the CONCAT_WS() function, where the first argument is the separator for the rest of the arguments, which is added between the strings to be concatenated:

SELECT id, 
       CONCAT_WS(',', field_1, field_2, field_3, field_4) list
FROM   `table`;

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