Many people are confused by various JOIN operations supported by SQL. Learn to master the SQL command line with this crash course in JOIN syntax.

In this SQL Server tip, Arthur Fuller explains the effects of NULLs, and the different results obtained by inner and outer JOINs.

I've been in an argument with one of our devs that took an update statement with an inner join and made it a left join (because inner was missing some records somehow in the left table - tableB in ...