SQL query to calculate totals - sql

Question

I'm quite new to SQL querying so please go easy on me if what I've done so far is really odd :)
I have two tables - A for Income and B for Expenditure:
Business_ID Income_Desc Income_Amount
1 Income A 1000
1 Income B 3000
1 Income C 2000
Business_ID Expen_Amount
1 2500
I'd like to produce a table that shows each of the income amounts, the one expenditure amount, the total income, the total expenditure and a Grand Total of total income-total expenditure.
Something like this if possible
Business_ID Income Description Income Amount Expenditure Amount Total
1 Income A 1000 2500 -
1 Income B 3000 - -
1 Income C 2000 - -
1 All Amounts 6000 2500 3500
This is what I've tried so far
SELECT a. Business_ID, COALESCE (a.Income_Desc, 'All Amounts') AS 'Income Description', SUM(a.Income_Amount) AS 'Income Amount', SUM(b.Expen_Amount) AS Expenditure Amount', (sum(a.Income_Amount)-SUM(b.Expen_Amount)) AS 'Total'
FROM Income AS a LEFT JOIN Expenditure AS b ON a.Business_ID = b. Business_ID
GROUP BY a. Business_ID, a.Income_Desc WITH ROLLUP
The result I'm getting is this
Business_ID Income Description Income Amount Expenditure Amount Total
1 Income A 1000 2500 -1500
1 Income B 3000 2500 500
1 Income C 2000 2500 -500
1 All Amounts 6000 7500 -1500
All Amounts 6000 7500 -1500
Is it possible to get an output like the one I provided above? Could you show me how to achieve it (or something very close) please?
Thanks

Answer 1

You can use row_number() for the join:
with ie as (
select i.business_id, i.income_desc, i.income_amount,
e.expen_amount
from (select i.*,
row_number() over (partition by business_id order by income_desc) as seqnum
from income i
) i left join
(select e.*,
row_number() over (partition by business_id order by expen_amount) as seqnum
from expenditure e
) e
on i.business_id = e.business_id and i.seqnum = e.seqnum
)
select ie.*
from ie
union all
select business_id, 'Total', sum(income_amount), sum(expen_amount)
from ie
group by business_id;

Answer 2

You could make a sub query out of your original query and only select values where the business ID is not null. Furthermore, use CASE WHEN to identify those values < 0 and replace it with "-":
SELECT x.Business_ID
, x.`Income Description`
, x.`Income Amount`
, x.`Expenditure Amount`
, x.Total
FROM
(SELECT a. Business_ID
, COALESCE (a.Income_Desc, 'All Amounts') AS 'Income Description'
, SUM(a.Income_Amount) AS 'Income Amount'
, SUM(b.Expen_Amount) AS 'Expenditure Amount'
, CASE WHEN (sum(a.Income_Amount)-SUM(b.Expen_Amount)) < 0
THEN '-'
ELSE (sum(a.Income_Amount)-SUM(b.Expen_Amount))
END AS 'Total'
FROM Income AS a
LEFT JOIN Expenditure AS b ON a.Business_ID = b.Business_ID
WHERE a.Business_ID is not null and b.Business_ID is not null
GROUP BY a.Business_ID, a.Income_Desc WITH ROLLUP) as x
where x.Business_ID is not null
DB Fiddle