php - MySQL: Get the TOP 3 referrers which referrals spend the most money -


i need top 3 referrers referrals spend money. need number of referrals , total amount referrals have spent. possible done in 1 query? far have query not sure can missing. please help! thank you!

select sum(t2.payment) total_payments, t2.username referral, t1.referrer referrer t1, t2  t1.username = t2.username   group referrer order total_payments desc  limit 0,10

t1 (user data, ~1000 records)

username   referrer  user1       user67 user2       user89 user3       user89   user4       user57 user5       user57 user6       user89 user7       user67 user8       user89 ...

t2 (user payments, ~300 records)

username    payment user1        100 user1        200 user2        350 user1         50 user5        500 user1        200 user3        150 user2         80 ...

below query should give correct result : 

 select t1.referrer referrer, count(t2.username) referral, sum(t2.payment) total_payments t1, t2  t1.username = t2.username   group referrer order total_payments desc  limit 0,10

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