MYSQL Issue in fetching profit data from multiple table - php

Question

I have 3 MYSQL Tables User table and 2 Transactions table.
My User table is as follows.
id inviter_id active .... (other columns)
2 1 1
3 1 1
4 2 1
5 1 1
6 2 1
My txn1 table is
id payer_id receiver_id amount type
1 2 1 20 profit
2 3 1 30 profit
3 4 2 20 profit
4 3 2 50 profit
5 5 2 20 profit
My txn2 table is
id payer_id receiver_id amount txn_type
1 2 1 20 profit
2 3 2 30 profit
3 4 2 20 profit
4 3 1 50 profit
5 5 1 20 profit
What I need to get is,
Consider I'm querying for the user 2. I need the profit he has earned from each of his downline or referrals using the inviter_id column.
For example, If I want to get the profit of User #2 from Txn1 and Txn2 table, it should get the txns made by user 4 and user 6 in txn1 and txn2 tables.
What I have tried so far is,
$userID = 2;
$this->db->select('u.id as partner_id, SUM(txn1_profit.amount) AS t1Profit, SUM(txn2_profit.amount) AS t2Profit');
$this->db->from('users u');
$this->db->join('txn1 txn1_profit', "u.id = txn1_profit.payer_id AND $userID = txn1_profit.receiver_id AND 'profit' = txn1_profit.txn_type",'LEFT');
$this->db->join('txn2 txn2_profit', "u.id = txn2_profit.payer_id AND $userID = txn2_profit.receiver_id AND 'profit' = txn2_profit.txn_type",'LEFT');
$this->db->where('u.inviter_id', $userID);
$this->db->group_by('u.id');
$query = $this->db->get();
$row = $query->result();
if (empty($row))
return FALSE;
return $row;
The problem with this query is i'm getting a huge sum value.

Answer 1

If schema of your transaction tables is same then I would suggest you to change your schema and have one single transaction table to store such information. By changing your current design will help you to build simple queries may reduce no. of joins.
For your current schema I can think of 2 possible ways to address your profit value issue.
Calculate sum from your transaction tables in sub-clause and then do a join with users table
select u.inviter_id,
sum(t1.t1Profit),
sum(t2.t2Profit),
sum(t1.t1Profit) + sum(t2.t2Profit) total
from users u
left join (
select payer_id, sum(amount) t1Profit
from tx1
where 2 = receiver_id
and 'profit' = type
group by payer_id
) t1 on u.id = t1.payer_id
left join (
select payer_id, sum(amount) t2Profit
from tx2
where 2 = receiver_id
and 'profit' = txn_type
group by payer_id
) t2 on u.id = t2.payer_id
where u.inviter_id = 2;
Or combine data of your transaction tables using union all and then do a join with users table
select u.inviter_id,
sum(t1.amount) total
from users u
left join (
select payer_id, amount
from tx1
where 2 = receiver_id
and 'profit' = type
union all
select payer_id, amount
from tx2
where 2 = receiver_id
and 'profit' = txn_type
) t1 on u.id = t1.payer_id
where u.inviter_id = 2;
DEMO