While there are other types of JOINs supported by various flavors of SQL, most implementations of SQL support the INNER JOIN, LEFT JOIN, and RIGHT JOIN constructs.

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

Hi there,I've got a little problem. I need to join two tables both have the field "Product_ID" but the contents of the columns differ slightly. For example:Table 1Field: Product_ID Datum: 423 ...