For any single occurrence of an entity, each attribute must have
Correct answer: A. Only one value
- A. Only one value
- B. More than one value
- C. No repeating groups
- D. Both (a) & (c)
Explanation
In a relational database, an entity represents a real-world object or concept (e.g., customer, product). An attribute is a characteristic of that entity (e.g., customer name, product price). The concept of a single entity occurrence refers to a specific instance of that entity (e.g., a particular customer or product). For data integrity and clarity within a table, each attribute within a single entity occurrence should ideally have only one value. This principle avoids ambiguity and simplifies data retrieval
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