Each row of the relationship table contains the relationship between two entities. Each diagram, symbol, or definition might take part in zero or some other even number of relationships; the number is always even because each relationship has an inverse which is stored. For example, a diagram contains a symbol, and the symbol is contained in the diagram.

The relationship table contains five field identifiers that can be used by the reporting system in tabular reports in addition to 24 relations (12 relation pairs), that are used to describe the relationship that exists between diagrams, symbols, and definitions.

Relationship table fields can only be used in complex reports. JOIN commands are used by the reporting system to move from the entity table to the relationship table and back. A report should always begin and end in the entity table.