Re: How to compute percentages

Hi,
Sindile,

Could you please try this variation of your own query, please?

Best,
Oliver

SELECT cl1, count(cl2) as no_accounts,
count(cl2) * 100.0 / (SELECT count(cl2) FROM tbl1) as percent_no_accounts,
sum(cl2) as consumption,
sum(cl2) * 100.0 / (SELECT sum(cl2) FROM tbl1) as percent_no_consumption
FROM tbl1
WHERE cl2 != 0
GROUP BY cl1
ORDER BY cl1;
----- Original Message -----
From: Sindile Bidla
To: pgsql-novice
Sent: Wednesday, May 23, 2012 12:23 PM
Subject: [NOVICE] How to compute percentages

I have a query that is like this:

SELECT cl1, count(cl2) as no_accounts, sum(cl2) as consumption
FROM tbl1
WHERE cl2 != 0
GROUP BY cl1
ORDER BY cl1;

this gives me the following output

cl1 no_accounts consumption
a 2 50
b 1 100
c 5 30

On the same query i want to calculate percentages no_accounts and consumption without having to create a table or view and then computing the percentages

cl1 no_accounts percent_no_accounts consumption percent_no_consumption
a 2 25 50 27
b 1 12 100 55
c 5 62 30 16