Subtract from rows with certain values - sql

Question

I have a table created in Materialized view from 10 different tables.
Part of it looks like this
group_name
value1
value2
group1
100
20
group2
200
40
unknown
300
60
TOTAL
600
120
I have to rearrange all values from rows with value group_name = 'unknown' to other rows. The final table should look like this
group_name
value1
value2
group1
200
40
group2
400
80
TOTAL
600
120
So formula for 'group1' would be:
unknown x group1 x (TOTAL-unknown) + group1
The table is created with massive code and please note - I didn't write it, it was given to me and I have to work with it. I don't like how it looks, so please spare your anger. Anyway, the query looks like this:
TABLESPACE pg_default
AS
WITH table_value1 AS (
SELECT
table1.group_name,
table1.value1,
FROM table1
), table_value2 AS (
SELECT
table2.group_name,
table2.value2,
FROM table2
), TOTAL_groups AS (
SELECT
'value1'::text AS group_name,
sum(xy_table."value1")::numeric as results
FROM xy_table
UNION ALL
SELECT
'value2'::text AS group_name,
sum(xy_table."value2")::numeric as results
FROM xy_table
UNION ALL
SELECT
'unknown'::text AS group_name,
sum(xy_table."unknown")::numeric as results
FROM xy_table
), TOTAL AS (
SELECT
TOTAL_groups.group_name,
TOTAL_groups.results
FROM TOTAL_groups
UNION ALL
'TOTAL'::text AS group_name,
round(sum(TOTAL_groups.raba), 1) as results
FROM skupaj_energenti
)
SELECT
a.group_name,
COALESCE(a.results, 0::numeric) AS value1,
COALESCE(a.results, 0::numeric) AS value2
FROM table_value1 a
LEFT JOIN table_value2 b ON b.group_name = a.group_name
LEFT JOIN TOTAL c ON f.group_name = a.group_name
WITH DATA;
I have no idea how should I write such conditions in SQL. Please help.

Answer 1

Distribute 'unknown' row to other rows. Assuming value1, value2 are DECIMAL
select group_name, value1 * (1 + k1) value1, value2 * (1 + k2) value2
from tbl
cross join (
select sum(case group_name when 'unknown' then value1 end) / sum(case group_name when 'TOTAL' then value1 else -value1 end) k1,
sum(case group_name when 'unknown' then value2 end) / sum(case group_name when 'TOTAL' then value2 else -value2 end) k2
from tbl
where group_name in ('TOTAL', 'unknown')
) t
where tbl.group_name not in ('TOTAL', 'unknown')
db<>fiddle