Below are three examples of Entities in a Database, including 5 properties of each Entity and which I would label a Unique Identifier.

• Entity: Equipment
• Properties

1. Manufacturer
2. Model
3. Description
4. Serial Number
5. Equipment Tag

• Unique Identifier: Serial Number

• Entity: Case
• Properties

1. Case Number
2. Subject
3. Description
4. Type
5. Status

• Unique Identifier: Case Number

• Entity: Equipment Loans
• Properties

1. Equipment Loan Number
2. Equipment Name
3. Loan Type
4. Loan Start Date
5. Estimated Return Date

• Unique Identifier: Equipment Loan Number