前言

本文主要介绍了关于mysql实现排名及查询指定用户排名功能(并列排名功能)的相关内容，分享出来供大家参考学习，下面话不多说了，来一起看看详细的介绍吧

表结构：

create table test.testsort (

id int(11) not null auto_increment,

uid int(11) default 0 comment '用户id',

score decimal(10, 2) default 0.00 comment '分数',

primary key (id)

)

engine = innodb

auto_increment = 1

character set utf8

collate utf8_general_ci

comment = '测试排序'

row_format = dynamic;

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：

select t.*, @rownum := @rownum + 1 as rownum

from (select @rownum := 0) r, (select * from testsort order by score desc) as t;

方法二：

select t.*, @rownum := @rownum + 1 as rownum

from (select @rownum := 0) r, testsort as t

order by t.score desc;

结果：

查看指定用户排名：

方法一：

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:

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;

结果：

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;

总结

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