如何将包含代码的初始表转换为其相应的描述

Question

I have the following table which contains only identifier codes:

importer	exporter	product
1	3	1001
2	1	1002
3	2	1003

in the actual database the importer, exporter, and product has a variable of j, i, and k respectively

The single digit codes were country codes, whereas the four digit codes refer to the product that these countries bought.

country_code	country_name
1	USA
2	Canada
3	UK

product_code	product_description
1001	agriculture
1002	petroleum
1003	electronics

I wanted to transform the initial table from only containing codes to becoming table that contains all of the details that these codes are referring to.

importer	exporter	product
USA	UK	agriculture
Canada	USA	petroleum
UK	Canada	electronics

I have tried the following in BigQuery

SELECT
  country.country_name_full AS buyer,
  product.description AS product_description,
  country.country_name_full AS seller
FROM
  `my-first-data-project-365122.cepii_export.country_codes` AS country
RIGHT JOIN
  `my-first-data-project-365122.cepii_export.Trade_Flow` AS raw_data
  ON  country.country_code = raw_data.j
RIGHT JOIN
  `my-first-data-project-365122.cepii_export.product_codes` AS product
  ON product.code = raw_data.k
RIGHT JOIN
  ON country.country_code = raw_data.i

I managed to get the first two rows (importer and product) to display correctly but when I tried to duplicate the join statement for the 'exporter' the program keep throwing me an error saying that the ON statement were unexpected

Answer 1

   SELECT Importer.country_name_full AS buyer,
   Exporter.country_name_full AS seller, 
   product.description AS product_description 
   FROM raw_data 
   LEFT JOIN Country_codes AS Importer ON Importer.country_code = 
   raw_data.j 
   LEFT JOIN Country_code AS Exporter ON Exporter.country_code = 
   raw_data.i LEFT JOIN Product_codes AS product ON product.code = raw_data.k