Calculation of percentage of group count(*)

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               


        

Answer 1

replace column name and try this:

SELECT  iName, 
    COUNT(iName) AS `Count`, 
    concat(FORMAT(((COUNT(iName) * 100) / NewPeople.iCount),2),'%') AS `Percentage`
FROM   people, (SELECT COUNT(iName) AS iCount FROM people) NewPeople 
GROUP BY iName;

Output:

Name   Count   Percentage
Sathish  5     50.00%
Jana     3     30.00%
Bala     2     20.00%