What Does This Query Mean: Select User_name, User_isp From Users Left

1.	What Does This Query Mean: Select User_name, User_isp From Users Left Join Isps Using (user_id) ?
Answer» It’s equivalent to saying SELECT user_name, user_isp FROM users LEFT JOIN isps WHERE users.user_id=isps.user_id It’s equivalent to saying SELECT user_name, user_isp FROM users LEFT JOIN isps WHERE users.user_id=isps.user_id

What Does This Query Mean: Select User_name, User_isp From Users Left Join Isps Using (user_id) ?

Answer»

It’s equivalent to saying SELECT user_name, user_isp FROM users LEFT JOIN isps WHERE users.user_id=isps.user_id