MySQL Inner Join Query To Get Records Not Present in Other Table

Question

I have table 1, all_countries, as follows-

id   |  country
------------------
1    |  USA
2    |  China
3    |  India
4    |  France
5    |  UK
6    |  Australia         


        

Answer 1

SELECT ac.country FROM all_countries ac LEFT JOIN supported_countries sc ON sc.country_name = ac.country_name WHERE ISNULL(sc.country_name)