Question

I have got sql table which has 2 columns userid and products, userid is unique while products will have 3 values[0,1,-1] -1 represents no products bought, 1 represents product currently
being used, while 0 represents product has been used.

What i want is a percentage query for total users in the table
product used (%): ?
products currently in use (%): ?
product not sold(%): ?

Any suggestion or assistance will be highly appreciated
Thanks

What I have tried so far?

Select count(userId) * 100 / (select count(products) Where products = 1) AS perc 
from product group by userid

Answer 1

Try this:

SELECT SUM(CASE WHEN products = 1 THEN 1 ELSE 0 END) * 100   /
Count(DISTINCT Products.UserID) AS 'Currently used products%',
SUM(CASE WHEN products = 0 THEN 1 ELSE 0 END) * 100   /
Count(DISTINCT Products.UserID) As 'Used products%',
SUM(CASE WHEN products = -1 THEN 1 ELSE 0 END) * 100   /
Count(DISTINCT Products.UserID) AS 'Not sold products%'
FROM Products