When to use EXCEPT as opposed to NOT EXISTS in Transact SQL?

Question

I just recently learned of the existence of the new \"EXCEPT\" clause in SQL Server (a bit late, I know...) thru reading code written by a coworker. It truly amazed me!

Answer 1

EXCEPT compares all (paired)columns of two full-selects. NOT EXISTS compares two or more tables accoding to the conditions specified in WHERE clause in the sub-query following NOT EXISTS keyword.

EXCEPT can be rewritten by using NOT EXISTS. (EXCEPT ALL can be rewritten by using ROW_NUMBER and NOT EXISTS.)

Got this from here