In this sample statement, the condition (table1.keyfield=table2.keyfield) tells SQL to find records in both tables that contain matching values in the column named by keyfield.

Fortunately, there are database development tools that can generate correct SQL queries for you, often by dragging and dropping tables and fields from the schema diagram into a query diagram. SQL ...

Designing an appropriate set of indexes can be one of the more troubling aspects of developing efficient relational database applications. Perhaps, the most important thing you can do to assure ...