May 2020
Beginner
564 pages
14h 9m
English
Content preview from Learn SQL Database Programming
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Understanding entity-relationship diagrams
You can use entity-relationship diagrams to visualize table relationships. This is sometimes referred to as an E-R diagram, or an ERD. In MySQL Workbench, the entity-relationship diagram, is referred to as an enhanced entity-relationship diagram or EER diagram. This just means that it's an entity-relationship diagram with enhanced features, such as being able to see object properties and constraints more easily. The lines that connect the tables to each other help you to determine what kind of relationships exists between the tables. The following table shows the connector lines and a description of what they mean:
| Connector | Description |
| Zero or one row matches between tables | |
| One, and only ... |
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