php mysql join multiple table

Question

I have two table

User

userID username     email
  1       abc    abc@abc.com
  2       def    def@def.com
  3       ghi    ghi@ghi.com

Referral

 refID userID      invEmail
   1      1      abc@def.com
   2      1      omg@mog.com
   3      1      def@def.com

So what i plan is to give a invited user 5 point meanwhile a inviter 10 point , so basically userID 1 gained 30 meanwhile userID 2 gained 5. The point i can do in PHP but one part i faced difficulty is when a invEmail to be identified. I don't mind separating into multiple queries if its will work.

How do i show this in sql?

I tried something like

SELECT *, count(r.userID) FROM user u, referral r WHERE u.userID = r.userID OR u.email = r.invEmail GROUP BY r.userID

It returned wrong value.

What i would like it to return , how much count is there inviter and invitee(matched email who has registered based on inviter invitation)

How should i do it?

Thank you.

Edit: i forgot to add something into question, what if i wanted the inviter to receive 10 points only if invitee registered? what i meant is that, only if invEmail exists in u.email then only userID received 10 point. Sorry for my mistake.

Answer 1

You might be able to do something like this:

select points.userId, points.username, points.email, sum(points.points)
FROM
(select u.*, count(*)*10 as points
  from user u
    join referral on u.userID = r.userID
    join user verify_user on r.invEmail = verify_user.email
  group by u.userID, u.username, u.email
UNION
select u.*, count(*)*5 as points
  from user u
    join referral on u.email = r.invEmail and u.userID != r.userID
  group by u.userID, u.username, u.email
) as points
group by points.userId, points.username, points.email

I think you need two separate selects to get the points for each type of registration, combined with a union statement.