Merging Two Tables and Calculating Amount (Currency Conversion) - sql

Question

I have table which contains the currency exchange rates and another one with converted amounts.
Currency Table
This table will have the daily rates of the currency. For the ease of mapping I have only included rates for one date.
Branch Code Rate Date
A 0 1 30/10/2019
A 1 200 30/10/2019
A 2 300 30/10/2019
B 0 1 30/10/2019
B 1 10 30/10/2019
B 2 30 30/10/2019
Converted Amounts Table
This table will have the daily exchange details. For the ease of mapping I have only included transactions for one date.
Branch Code Amt Date
A 0 1000 30/10/2019
A 1 2000 30/10/2019
A 2 3000 30/10/2019
A 2 4000 30/10/2019
A 2 5000 30/10/2019
A 0 6000 30/10/2019
B 0 7000 30/10/2019
B 0 8000 30/10/2019
B 0 9000 30/10/2019
B 2 10000 30/10/2019
Resultant Table
Branch Code Date Amt Branch Code Rate Total
A 0 30/10/2019 1000 A 0 1 1000
A 1 30/10/2019 2000 A 1 200 400000
A 2 30/10/2019 3000 A 2 300 900000
A 2 30/10/2019 4000 A 2 300 1200000
A 2 30/10/2019 5000 A 2 300 1500000
A 0 30/10/2019 6000 A 1 1 6000
B 0 30/10/2019 7000 A 1 200 1400000
B 0 30/10/2019 8000 A 1 200 1600000
B 0 30/10/2019 9000 A 1 200 1800000
B 2 30/10/2019 10000 A 2 300 3000000
I could only get the following resultant table.
Branch Code Date Amt Branch Code Rate Total
A 0 30/10/2019 1000 A 0 1 1000
A 1 30/10/2019 2000 A 1 200 400000
A 2 30/10/2019 3000 A 2 300 900000
A 2 30/10/2019 4000 A 2 300 1200000
A 2 30/10/2019 5000 A 2 300 1500000
A 0 30/10/2019 6000 A 1 1 6000
B 0 30/10/2019 7000 A 1 1 7000
B 0 30/10/2019 8000 A 1 1 8000
B 0 30/10/2019 9000 A 1 1 9000
B 2 30/10/2019 10000 A 2 300 3000000
Query I use.
SELECT
*
FROM
converted_amounts_table t1
LEFT OUTER JOIN (
SELECT
(
CASE WHEN code = '0'
AND branch = 'B' THEN '1' ELSE code END
) AS new_code,
branch,
date,
rate
FROM
currency_table
) t2 ON (
t1.date = t2.date
AND t1.code = t2.new_code
)
WHERE
t1.date >= '01-Jan-2019'
AND t1.date <= '30-Sep-2019'

Answer 1

I was able to get the resultant table.
https://dbfiddle.uk/?rdbms=oracle_11.2&fiddle=4d5401320bda5ad736070541d55d1d04
SELECT
t1.branch,
t1.date2,
t1.code,
t2.code,
t2.new_code,
t2.rate,
t1.amt,
t1.amt * t2.rate AS Total
FROM
converted_amounts_table t1
LEFT OUTER JOIN (
SELECT
(CASE WHEN code = 1 THEN 0 ELSE code END) AS new_code,
branch,
date1,
code,
rate
FROM
currency_table
WHERE
branch = 'A'
) t2 ON (
t1.date2 = t2.date1
AND t1.code IN (t2.new_code, t2.code)
)
WHERE
t1.date2 = '30 - Oct - 2019'
AND (
t1.branch, t1.code, t2.code, t2.new_code,
t2.rate
) NOT IN (
('B', 0, 0, 0, 1),
('A', 0, 1, 0, 200)
)