Cálculo del porcentaje del recuento de grupos (*)

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 

Cómo obtener el valor porcentual para el formato dado;

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

¿Le gustaría compartir la consulta sql?

Answer 1

Esta consulta (no probado) debería funcionar:

SELECT Name, 
COUNT(*) AS Count, 
(COUNT(*)/_total) * 100 AS Percentege 
FROM Namelist, 
(SELECT COUNT(*) AS _total 
    FROM Namelist) AS myTotal 
GROUP BY Name; 

Answer 2

sustituir a nombre de la columna y probar este:

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; 

Salida:

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

Answer 3

select 
name, 
count(name) as `count`, 
count(name)/(select count(*) from namelist)*100 as pct 
from namelist 
group by name 

Answer 4

Este es un poco versión más sexy de algunas de las otras respuestas - note th e uso de sum(100) para evitar el más largo (y más mundanas) 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