如何将多列合为一体并使用自定义字符串设置格式? [英] How to combine multiple columns as one and format with custom strings?
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问题描述
SELECT id, <X> AS name FROM `table`
基本上<X>
是
的组合
姓氏+','+姓氏
Basically <X>
is a combination of
lastname + ', ' + firstname
示例将是
id | name |
2 | Smith, Bob |
3 | Jones, Susy |
这只是一个例子,我真的不想合并这么简单的名称.
This is just an example, I don't really want to combine names so simple.
推荐答案
如果要连接许多字段,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,并在要串联的字符串之间添加:
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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