| A | B |
|---|
| Arc | A curved line used to represent an exclusive relationship in an entity-relationship diagram |
| Exclusive OR relationship | A logical operator that returns a true value if one, but not both, of its operands is true. |
| Mutually exclusive relationship | A relationship that has choices that are unable to be true at the same time. |
| Constraint | A restriction that applies to data, which is often dictated by the business rules. |
| Recursive relationship | A relationship between an entity and itself. |
| Hierarchical relationship | A series of relationships that reflect entities organized into successive levels. |
| Transitive dependency | A condition that exists when any attribute in an entity is dependent upon any other non-UID attribute in that entity. |
| Feedback | An evaluative response. |
| Formulate | To express in systematic terms or concepts. |
| Consultant | In the information technology industry, one who provides expert services, such as data modeling, database troubleshooting, installation support, etc. |
| Audit trail | A step-by-step record of data changes. |
| Historical data | Data that records changes over time. |
