Question

I have a table with countries, years and amounts for each year. I’m trying to write a query that will sum the total amounts for a given year and give it to me as a column.

For example, to have an output that looks like:

Country   1991     1992     1993
France     25       12       38

I tried a query like this, but to no avail:

SELECT 
     country as "Recipient", 
     SUM(usd_amount) AS "1991" WHEN project_year = 1991,
     SUM(usd_amount) AS "1992" WHEN project_year = 1992,
     SUM(usd_amount) AS "1993" WHEN project_year = 1993

FROM tb1

GROUP BY project_year, country
order by country, project_year

Any Suggestions?
Thanks!
Chris

Answer 1

Give this a try:

SELECT 
     country as "Recipient", 
     SUM(if(project_year = 1991, usd_amount, 0)) AS "1991",
     SUM(if(project_year = 1992, usd_amount, 0)) AS "1992",
     SUM(if(project_year = 1993, usd_amount, 0)) AS "1993",
FROM tb1
GROUP BY country
ORDER BY country

PS: It makes no sense to order by project year as you’re already aggregating on it.