Question

I am trying to perform two different SUMs within a single query.

user   points   date_achieved
-----------------------------
Foo    10       2000-01-01
Foo    20       2011-11-18
Bar    10       2000-01-01
Bar    20       2011-11-15
Bar    30       2011-11-18

1) Total points

SELECT user, SUM(points) AS points_total
FROM myTable
GROUP BY user

2) Points accumulated within the past month

SELECT user, SUM(points) AS points_month
FROM myTable
WHERE date_achieved >= CURRENT_DATE - INTERVAL 1 MONTH
GROUP BY user

What is the best way to achieve this with a single query?

Many thanks.

Answer 1

Just use a case statement to only count points when it meets your criteria.

SELECT 
       user, 
        SUM(points) AS points,
        SUM(case  
            when date_achieved >= (CURRENT_DATE - INTERVAL 1 MONTH) 
            THEN points 
             else 0 END) points_last_Month
FROM myTable
GROUP BY user