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分享程序员开发的那些事...
且构网 - 分享程序员编程开发的那些事

首先按特定字段值排序

更新时间:2023-01-30 13:36:47

还有 MySQL FIELD 函数.

There's also the MySQL FIELD function.

如果您想对所有可能的值进行完整排序:

If you want complete sorting for all possible values:

SELECT id, name, priority
FROM mytable
ORDER BY FIELD(name, "core", "board", "other")

如果您只关心核心"是第一位的,而其他值无关紧要:

If you only care that "core" is first and the other values don't matter:

SELECT id, name, priority
FROM mytable
ORDER BY FIELD(name, "core") DESC

如果要先按核心"排序,其他字段按正常排序:

If you want to sort by "core" first, and the other fields in normal sort order:

SELECT id, name, priority
FROM mytable
ORDER BY FIELD(name, "core") DESC, priority

不过这里有一些警告:

首先,我很确定这是仅限 mysql 的功能 - 问题被标记为 mysql,但您永远不知道.

First, I'm pretty sure this is mysql-only functionality - the question is tagged mysql, but you never know.

其次,注意FIELD() 的工作原理:它返回值的基于一个的索引 - 在 FIELD(priority,"core"),如果"core"是值,它会返回1.如果该字段的值不在列表中,则返回.这就是为什么 DESC 是必要的,除非您指定所有可能的值.

Second, pay attention to how FIELD() works: it returns the one-based index of the value - in the case of FIELD(priority, "core"), it'll return 1 if "core" is the value. If the value of the field is not in the list, it returns zero. This is why DESC is necessary unless you specify all possible values.