MySQL - specific columns on join?

Question

When making a join (inner, left outer, right outer or whatever), how can I specify which columns on the table to join into the original table?

Consider the following exa

Answer 1

This will only include User.FirstName and Provider.ProviderID in the final resultset:

SELECT User.FirstName, Provider.ProviderID FROM User LEFT OUTER JOIN Provider ON User.ProviderID = Provider.ID