MySQL having three joins that needs form in one join - mysql

Question

i need to join tables to see which product is cheaper in terms of their continent. i have provided more detail below.
I have the following four tables:
country Product1 Product2 Product3
Austria 0.01 0.011 0.018
Cuba 0.15 0.015 0.012
Angola 0.17 0.017 0.019
Benin 0.84 0.015 0.025
Belize 0.24 0.019 0.018
where table name is PriceComparison
Code name continent_code
AD Andorra EU
AF Afghanistan AS
AI Anguilla NA
AL Albania EU
AO Angola AF
table name is countries
Id Name countrycode
1 Albania AL
2 Algeria DZ
3 Andorra AD
4 Angola AO
5 Austria AT
table name is CountryList
code name
AF Africa
AN Antarctica
AS Asia
EU Europe
NA North America
OC Ocenia
SA South America
table name is continents
Code name continent_code
AD Andorra EU
AF Afghanistan AS
AI Anguilla NA
AL Albania EU
AO Angola AF
table name is countries
Id Name countrycode
1 Albania AL
2 Algeria DZ
3 Andorra AD
4 Angola AO
5 Austria AT
table name is CountryList
code name
AF Africa
AN Antarctica
AS Asia
EU Europe
NA North America
OC Ocenia
SA South America
table name is continents
I need to update my PriceComparison with all the other tables i have. The objective here is to see which continent we are cheaper in terms of our products. Product1 is my product. Product1's price needs to be compared with product2's price and again product1's price needs to be compared to product3's price in terms of where my product is cheaper per continent.
Can someone assist with this query?
Tried so far:
select countries.continent_code,
continents.code,
CountryList.countrycode,
countries.code,
PriceComaprison.country,
CountryList.name
from CountryList as CL
inner join countries
on countries.continent_code = continents.code
inner join CL
on CL.countrycode = countries.code
inner join PriceComparison
on PriceComparison.country = CL.name
sample data:
countries: code (AS, AI,AO, BB,CA) name (the actual country name - eg.America Samao) continent_code (OC,NA,AN - the actual continent_code of the country)
CountryList table: id Name countrycode
continents: code name

Answer 1

Based on what you explained in the comments, this could be close to what you need:
select con.code continenct_code, con.name as continent, product1, Product2, product3
from PriceComparison p join countries c on p.country = c.name
join continents con on con.code = c.continent_code
where Product1 < Product2 and Product1 < Product3
However, the sample data you have provided is not correct. As it is already mentioned in the comments to your question, there are countries in the PriceComparison table that do not exist in the Countries table-if you run this with your real data I would assume this should work.
I did modify a little your data and you can check it here.

Answer 2

This query will show the average price of each product per continent, if you want the smallest price per continent use MIN() instead of AVG()
SELECT con.code,
AVG(p.product1),
AVG(p.product2),
AVG(p.product3)
FROM PriceComparison p
JOIN countries c ON p.country = c.name
JOIN continents con ON con.code = c.continent_code
GROUP BY con.code