Question

I have following tables:

base:
id | domain

extended:
id | domain | country_code

countries:
id | country_code | country_name

banned_domains:
id | domain

I will have several thousands (more than 500K) of domains in banned_domains. Now I need to fetch data “domain, country_code and country_name” which do not exist on banned_domains list. I am not so good at the MySQL JOINS, can anyone guide me for the proper query.

Answer 1

SELECT b.domain, ex.country_code, c.country_name FROM base b 
INNER JOIN extended ex ON b.domain=ex.domain
INNER JOIN countries c ON ex.country_code=c.country_code
WHERE b.domain NOT IN (SELECT domain FROM banned_domains);