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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Databases cover tables, records, fields, keys and relationships, together with database management systems and relational database design. The subject includes primary and foreign keys, normalization, SQL commands such as SELECT, INSERT, UPDATE and DELETE, queries, forms and reports, while distinguishing a database from a spreadsheet used for simple tabular data.
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