Use JOIN vs. UNION in SQL
How to use JOIN vs. UNION in SQL So many newbies to Transact-SQL have difficulties determing when to use a UNION or a JOIN to satisy their query. This video teaches you some guidelines to help you quickly and easily identify whether your query will likely need to become a JOIN or UNION. Disclaimer: these are just guidelines and they will not work in every situation but they are applicable for most SQL developers most of the time.
