MySQL实现排名并查询指定信息排名功能，并列排名功能

思路：可以先排序，再对结果进行编号；也可以先查询结果，再排序编号。

说明：

@rownum := @rownum + 1 中 := 是赋值的作用，这句话的意思是先执行@rownum + 1，然后把值赋给@rownum；

(SELECT @rownum := 0) r 这句话的意思是设置rownum字段的初始值为0，即编号从1开始。

实现排名：

方法一：

PHP
SELECT t., @rownum := @rownum + 1 AS rownum FROM (SELECT @rownum := 0) r, (SELECT FROM testsort ORDER BY score DESC) AS t;
方法二：

PHP
SELECT t.*, @rownum := @rownum + 1 AS rownum FROM (SELECT @rownum := 0) r, testsort AS t ORDER BY t.score DESC;
查看指定用户排名：

方法一：

PHP
SELECT b. FROM ( SELECT t., @rownum := @rownum + 1 AS rownum FROM (SELECT @rownum := 0) r, (SELECT * FROM testsort ORDER BY score DESC) AS t ) AS b WHERE b.uid = 222;
方法二:

PHP
SELECT b. from ( SELECT t., @rownum := @rownum + 1 AS rownum FROM (SELECT @rownum := 0) r, testsort AS t ORDER BY t.score DESC ) as b where b.uid = 222;

////////////////////////////////////////实例/////////////////////////////////

PHP
<?php $csql=$empire->fetch1("SELECT b. FROM( SELECT t., @rownum := @rownum + 1 AS rownum FROM (SELECT @rownum := 0) r, (SELECT * FROM ecms_games where leixing = 2 ORDER BY onclick DESC) AS t ) AS b WHERE b.id = 11;"); if($csql) echo $csql[rownum]; ?>

实现并列排名（相同分数排名相同）：

SELECT

obj.uid,

obj.score,

CASE

WHEN @rowtotal = obj.score THEN

@rownum

WHEN @rowtotal := obj.score THEN

@rownum :=@rownum + 1

WHEN @rowtotal = 0 THEN

@rownum :=@rownum + 1

END AS rownum

FROM

(

SELECT

uid,

score

FROM

testsort

ORDER BY

score DESC

) AS obj,

(SELECT @rownum := 0 ,@rowtotal := NULL) r

查询指定用户并列排名:

SELECT total.* FROM

(SELECT

obj.uid,

obj.score,

CASE

WHEN @rowtotal = obj.score THEN

@rownum

WHEN @rowtotal := obj.score THEN

@rownum :=@rownum + 1

WHEN @rowtotal = 0 THEN

@rownum :=@rownum + 1

END AS rownum

FROM

(

SELECT

uid,

score

FROM

testsort

ORDER BY

score DESC

) AS obj,

(SELECT @rownum := 0 ,@rowtotal := NULL) r) AS total WHERE total.uid = 222;

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