Ideas in this flowchart

• Database relationships
• A database relationship connects records.
• The records represent information.
• The information can be associated.
• The relationship connects associated records.
• The example concerns a book.
• A book can contain sections.
• A book can contain many sections.
• The sections belong to the book.
• Each section belongs to a specific book.
• The book–section relationship shows this association.
• Relationships preserve structure.
• The relationship preserves the book–section structure.
• The relationship does not require copying the same information.
• The same information need not be copied into every record.