Yearly income and expenses table - mysql

Question

i have two tables
Income
(id,
income,
date,
userid)
and table
Expense
(id,amount,date,userid). Now I'm trying to create a View with sum of income, sum of amount in one year. Also it must be GROUPED by year and userid.
So new table (view) must have sum of income, expenses, year. Right now i am stuck on this code.
SELECT
id,
i.Prihod,
e.Rashod,
YEAR
YEAR(COALESCE(e.god, i.godi))) AS Godina ,
users_id
FROM
(
SELECT
sum(insum) as 'Prihod',
YEAR(datum) as 'Godi',
users_id
FROM
GROUP BY users_id
) as i
FULL OUTER JOIN
(
SELECT
sum(amount) as 'Rashod',
YEAR(datum) as 'God',
users_id
FROM expense
GROUP BY users_id
) as e

Answer 1

This is a job for the structured part of structured query language. Start with three subqueries (virtual tables).
First: A list of the years and users. You need this because MySQL doesn't have FULL OUTER JOIN capability. If you write this query correctly, it will contain one row for each user for each year you need.
SELECT DISTINCT YEAR(datum) Godi, users_id FROM income
UNION
SELECT DISTINCT YEAR(datum) Godi, users_id FROM expense
Second, a summary of the income by year and user.
SELECT sum(insum) as Prihod,
YEAR(datum) as Godi,
users_id
FROM income
GROUP BY YEAR(datum), users_id
Third, a similar sum of expenses by year and user
SELECT sum(amount) as Rashod,
YEAR(datum) as God,
users_id
FROM expense
GROUP BY YEAR(datum), users_id
Next, test these subqueries individually, standalone, to ensure you have the results you expect.
Finally, join them together as if they were tables, like so
SELECT yr.users_id, yr.Godi, inc.Prihod, exp.Rashod
FROM (
SELECT DISTINCT YEAR(datum) Godi, users_id FROM income
UNION
SELECT DISTINCT YEAR(datum) Godi, users_id FROM expense
) yr
LEFT JOIN (
SELECT sum(insum) as Prihod,
YEAR(datum) as Godi,
users_id
FROM income
GROUP BY YEAR(datum), users_id
) inc ON yr.users_id = inc.users_id AND yr.Godi = inc.Godi
LEFT JOIN (
SELECT sum(amount) as Rashod,
YEAR(datum) as God,
users_id
FROM expense
GROUP BY YEAR(datum), users_id
) exp ON yr.users_id = exp.users_id AND yr.Godi = exp.God
The query pattern here is to develop three subqueries. The first of them determines the number of rows in your final result set, because it contains one row for each desired row. The second and third queries have one, or maybe zero, rows for each row you need in your final result set. Then you join them together.