MySQL相当于ORACLES rank() [英] MySQL equivalent of ORACLES rank()

问题描述

Oracle有2个函数-rank()和density_rank()-我发现它们对某些应用程序非常有用.我现在正在mysql中做某事，想知道他们是否有与之等效的东西?

Oracle has 2 functions - rank() and dense_rank() - which i've found very useful for some applications. I am doing something in mysql now and was wondering if they have something equivalent to those?

推荐答案

没有什么直接等价的，但是您可以使用一些(不是很有效)自联接来伪造它.来自收集的MySQL查询方法的一些示例代码:

Nothing directly equivalent, but you can fake it with some (not terribly efficient) self-joins. Some sample code from a collection of MySQL query howtos:

SELECT v1.name, v1.votes, COUNT(v2.votes) AS Rank
FROM votes v1
JOIN votes v2 ON v1.votes < v2.votes OR (v1.votes=v2.votes and v1.name = v2.name)
GROUP BY v1.name, v1.votes
ORDER BY v1.votes DESC, v1.name DESC;
+-------+-------+------+
| name  | votes | Rank |
+-------+-------+------+
| Green |    50 |    1 |
| Black |    40 |    2 |
| White |    20 |    3 |
| Brown |    20 |    3 |
| Jones |    15 |    5 |
| Smith |    10 |    6 |
+-------+-------+------+ 

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