SELECT * FROM country LEFT JOIN country_ru ON country_ru.countryID = country.countryID
LEFT JOIN country_category ON country_category.countryCategoryID = country.countryCategoryID
LEFT JOIN country_category_ru ON country_category_ru.countryCategoryID = country.countryCategoryID
LEFT JOIN currency ON country.currencyID = currency.currencyID WHERE country.countryID = ;
Неправильный запрос