Question

I need to join the following two tables

table_A
id    userId    name        score   game
1      2343     me          45       Palo Alto
2      6575     other       21       SF
3      6575     other           2        miami

table_B
id  userId      pen     mango
1    2343       3       4
2   2343        5       7
3   6575        1       2

Here is the join:

SELECT COUNT(a.userId), SUM(b.pen), SUM(b.mango) 
  FROM table_A AS a 
  LEFT JOIN table_B b ON a.userId = b.userId 
    WHERE userId = 2343;

The problem is I am getting count(userId) equals to 2, but I need it to be 1. What am I doing wrong?

Answer 1

Change it to the following:

count(distinct a.userId)