Which field listed below is the most appropriate primary key?
Correct answer: C. A customer's Id
- A. A person's last name
- B. An employee salary
- C. A customer's Id
- D. A sale's person region
Explanation
The correct answer is (c) A customer's ID number.A primary key is a field (or set of fields) in a database table that uniquely identifies each row in the table. This means that no two rows in the table can have the same value for the primary key. A customer ID number is typically a unique identifier assigned to each customer, making it a good choice for a primary key.
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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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