Sum of group by using mysql - mysql

Question

I am having three tables financial_year, house_details, consumer_details. I need to get the sum of each tax group by year and subincome. My table and query is in this link: sqlfiddle
Getting Result:
Name house_number address subincome financial_year gtax htax LTAX
--------------------------------------------------------------------------
Bala 22 Mumbai Garbage tax 2015-2016 200 NULL NULL
Bala 22 Mumbai Garbage tax 2016-2017 250 NULL NULL
Bala 22 Mumbai House tax 2015-2016 NULL 0 NULL
Bala 22 Mumbai House tax 2016-2017 NULL 145 NULL
Bala 22 Mumbai Light tax 2015-2016 NULL NULL 510
Bala 22 Mumbai Light tax 2016-2017 NULL NULL 200
Expecting Result:
Name house_number address gtax htax LTAX
--------------------------------------------------------
Bala 22 Mumbai 450 145 710

Answer 1

You are looking for conditional aggregation note this solution only works if there is an entry for each subincome(tax type)in house details for each financial year.
SELECT c.consumer_name as Name, c.house_number, c.address,
sum(CASE WHEN h.subincome = 'Garbage tax' THEN f.garbage_tax else 0 end) -
sum(CASE WHEN h.subincome = 'Garbage tax' THEN h.rupees else 0 END) as gtax,
sum(CASE WHEN h.subincome = 'House tax' THEN f.house_tax else 0 end) -
sum(CASE WHEN h.subincome = 'House tax' THEN h.rupees else 0 END) as htax,
sum(CASE WHEN h.subincome = 'Light tax' THEN f.light_tax else 0 end) -
sum(CASE WHEN h.subincome = 'Light tax' THEN h.rupees else 0 END) as LTAX
from house_details h
INNER JOIN financial_year f ON h.financial_year = f.year AND h.house_id = f.house_number
INNER JOIN consumer_details c ON h.house_id = c.house_number AND h.financial_year != '2017-2018'
group by c.consumer_name , c.house_number, c.address
result
+------+--------------+---------+------+------+------+
| Name | house_number | address | gtax | htax | LTAX |
+------+--------------+---------+------+------+------+
| Bala | 22 | Mumbai | 450 | 145 | 710 |
+------+--------------+---------+------+------+------+
1 row in set (0.03 sec)
If it is not guaranteed that there will be an entry for every subincome in every financial year then the the solution has to be driven from the tax due table (financial year) which in my view is badly designed ,inflexible and forces a sub optimal solution
select c.consumer_name as Name, s.house_number, c.address,
sum(case when subincome = 'garbage tax' then taxdue else 0 end) - sum(case when subincome = 'garbage tax' then taxpaid else 0 end) as gtax,
sum(case when subincome = 'house tax' then taxdue else 0 end) - sum(case when subincome = 'house tax' then taxpaid else 0 end) as htax,
sum(case when subincome = 'light tax' then taxdue else 0 end) - sum(case when subincome = 'light tax' then taxpaid else 0 end) as ltax
from
(
SELECT F.`house_number`, F.`year`, F.`house_tax` taxdue, F.`createdAt`, F.`updatedAt`,ifnull(h.subincome,'house_tax') subincome,ifnull(H.RUPEES,0) taxpaid
FROM FINANCIAL_YEARS F
LEFT JOIN house_details H ON H.HOUSE_ID = F.HOUSE_NUMBER AND H.SUBINCOME = 'house tax' and f.year = h.financial_year
#where f.house_number = 22
union all
SELECT F.`house_number`, F.`year`, F.`light_tax`, F.`createdAt`, F.`updatedAt`,ifnull(h.subincome,'light tax'),ifnull(H.RUPEES,0)
FROM FINANCIAL_YEARS F
LEFT JOIN house_details H ON H.HOUSE_ID = F.HOUSE_NUMBER AND H.SUBINCOME = 'light tax' and f.year = h.financial_year
#where f.house_number = 2
union all
SELECT F.`house_number`, F.`year`, F.`garbage_tax`, F.`createdAt`, F.`updatedAt`,ifnull(h.subincome,'garbage tax'),ifnull(H.RUPEES,0)
FROM FINANCIAL_YEARS F
LEFT JOIN house_details H ON H.HOUSE_ID = F.HOUSE_NUMBER AND H.SUBINCOME = 'garbage tax' and f.year = h.financial_year
#where f.house_number = 2
) s
join consumer_details c on s.house_number = c.house_number
where s.year <> '2017-2018'
group by c.consumer_name , s.house_number, c.address

Answer 2

Try this it will give exact result which you want, I just create a drive table and then sum
SELECT name
, house_number
, address
, SUM(gtax) as gtax
, SUM(htax) as htax
, SUM(LTAX) LTAX
FROM (SELECT c.consumer_name as Name
, c.house_number
, c.address,h.subincome
, h.financial_year
, CASE WHEN h.subincome = 'Garbage tax' THEN f.garbage_tax - sum(h.rupees)END as gtax
, CASE WHEN h.subincome = 'House tax' THEN f.house_tax - sum(h.rupees) END as htax
, CASE WHEN h.subincome = 'Light tax' THEN f.light_tax - sum(h.rupees) END as LTAX
FROM house_details h
INNER JOIN financial_year f ON h.financial_year = f.year AND h.house_id = f.house_number
INNER JOIN consumer_details c ON h.house_id = c.house_number AND h.financial_year != '2017-2018'
GROUP BY h.subincome, h.financial_year) as main
GROUP BY house_number
then result is :