MySql JOIN two tables SUM wrong result from left table - mysql

Question

I have a two table and I have left join and want sum of value from both table.
But the result from second table not retrieved successfully (SUM not group by properly)
Table test1
id redeem_count cost camp_id
1 2 500 1
2 3 1000 1
3 2 2000 2
4 2 3000 2
5 2 1200 3
Table test2
id bill_amount earning test1_id
1 4000 50 1
2 5000 55 3
3 6000 60 4
Output
camp_id redeem cost bill earning
1 5 1500 15000 165
2 4 5000 NULL NULL
3 2 1200 NULL NULL
Desired Result
camp_id redeem cost bill earning
1 5 1500 4000 50
2 4 5000 11000 115
3 2 1200 0 0
I have execute following SQL.
SELECT
t1.camp_id,
t1.redeem,
t1.cost,
t2.bill,
t2.earning
FROM (SELECT COALESCE(SUM(redeem_count),0) AS redeem, COALESCE(SUM(cost),0) AS cost, id,camp_id FROM test1 GROUP BY camp_id) t1
LEFT JOIN(SELECT COALESCE(SUM(bill_amount),0) AS bill, COALESCE(SUM(earning),0) AS earning, test1_id FROM test2) t2
ON t1.id = t2.test1_id
How can I achieve desired result? Would you please provide the solution?

Answer 1

SELECT
t1.camp_id,
t1.redeem,
t1.cost,
t2.bill,
t2.earning
FROM (SELECT COALESCE(SUM(redeem_count),0) AS redeem, COALESCE(SUM(cost),0) AS cost, id,camp_id FROM test1 GROUP BY camp_id) t1
LEFT JOIN(SELECT COALESCE(bill_amount) AS bill, COALESCE(earning) AS earning, test1_id FROM test2) t2
ON t1.id = t2.test1_id

Answer 2

try this:
SELECT
t1.camp_id,
t1.redeem,
t1.cost,
t2.bill,
t2.earning
FROM (SELECT COALESCE(SUM(redeem_count),0) AS redeem, COALESCE(SUM(cost),0) AS cost, id,camp_id FROM test1 GROUP BY camp_id) t1
LEFT JOIN(SELECT COALESCE(bill_amount) AS bill, COALESCE(earning) AS earning, test1_id FROM test2) t2
ON t1.id = t2.test1_id
update:1
SELECT
t1.camp_id,
t1.redeem,
t1.cost,
t2.bill,
t2.earning
FROM
(
SELECT
COALESCE(SUM(redeem_count),0) AS redeem,
COALESCE(SUM(cost),0) AS cost,
id,
camp_id
FROM test1
GROUP BY camp_id) t1
LEFT JOIN(
SELECT
SUM(bill_amount) AS bill,
SUM(earning) AS earning, test1_id FROM test2 GROUP BY test1_id) t2
ON t1.camp_id= t2.test1_id
My code produced output like:
camp_id redeem cost bill earning
1 5 1500 4000 50
2 4 5000 11000 115
3 2 1200 (NULL) (NULL)

Answer 3

EDITED
Create your subquery like when you want to query only the required result, then join those results.
(Query is not tested!)
SELECT
X1.camp_id
, X1.redeem
, X1.redeem
, X2.cost
, X2.earning
FROM
(
SELECT
SUM(redeem_count) AS redeem,
SUM(cost) AS cost,
id,
camp_id
FROM
test1
GROUP BY
camp_id
) X1
LEFT JOIN (
SELECT
T1.camp_id,
SUM(T2.bill_amount) AS bill,
SUM(T2.earning) AS earning
FROM
test1 T1
INNER JOIN test2 T2
ON T1.id = T2.id
GROUP BY
T1.camp_id
) X2
ON X1.camp_id = X2.camp_id