组合两个松散连接的MySQL表

So I have two MYSQL tables in a DB which aren't connected (two different data sources) [around 500,000 rows in each]. They have things like Business Name, Business Address, City, State, along with some specific information in each that I hoped to populate a third table with once I've figured out how to 'link' the two together.So I have two MYSQL tables in a DB which aren't