mysql - 计算组数百分比(*)

Question

Select * from Namelist;
Name      Age
Sathish   25
Sathish   65
Sathish   55
Sathish   45
Sathish   35
Jana      55
Jana      25
Jana      10
Bala      55
Bala      26

如何获取给定格式的百分比值；

Name   Count   Percentege
Sathish  5     50%
Jana     3     30%
Bala     2     20%

请分享sql查询？

Answer 1

这是一些其他答案的稍微性感的版本 - 请注意 sum(100) 的使用以避免更长(更平凡)的 count(*) * 100 :)

select name, count(*) as count, sum(100) / total as percentage
from namelist
cross join (select count(*) as total from namelist) x
group by 1