In a three-way join, the sql-expression consists of two conditions: one relates the first table to the second table and the other relates the second table to the third table.

A join combines two or more tables side by side. If you do not specify how to join the tables, you get a Cartesian product. This means that SQL combines each row from the first table with every row ...

Read this SQL tutorial to learn when to use SELECT, JOIN, subselects and UNION to access multiple tables with a single statement.

I have the following query trying to grab the user information from tbl_Users for two different people- the user that submitted the revision, and the user that added CMRB approval: SELECT * FROM ...

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