Year 11 Exam > Year 11 Notes > Computer for GCSE/IGCSE > Primary Keys
Primary Keys | Computer for GCSE/IGCSE - Year 11 PDF Download
Primary Keys
- Every table contains a primary key field, serving as a distinctive identifier:
- Each data item in this field is unique.
- Attempting to input duplicate data items into the primary key field is prevented.
- Due to the uniqueness of data items within the primary key field, they can effectively identify individual records.
A Database Table Containing Customer Details
- In the given customer table example, the primary key would likely be the CustomerID since each customer possesses a unique ID.
- Even if multiple customers share the same name, they can be accurately identified using their respective CustomerID.
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FAQs on Primary Keys - Computer for GCSE/IGCSE - Year 11
| 1. What is a primary key in the context of database tables? |  |
Ans. A primary key is a unique identifier for a record in a database table. It ensures that each record is distinct and can be easily located within the table.
| 2. Why is it important to have primary keys in database tables? | |
Ans. Primary keys are important in database tables as they help in ensuring data integrity, enforcing uniqueness, and establishing relationships between different tables.
| 3. Can a primary key be duplicated within a database table? | |
Ans. No, a primary key cannot be duplicated within a database table. Each record must have a unique primary key value to maintain the integrity of the data.
| 4. How are primary keys different from foreign keys in database tables? | |
Ans. Primary keys uniquely identify records within a table, while foreign keys establish relationships between tables by referencing the primary key of another table.
| 5. What are some examples of primary keys commonly used in database tables? | |
Ans. Examples of primary keys include student IDs, order numbers, employee IDs, and customer account numbers. These are unique identifiers for each record in a table.
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Nov 22, 2024 Last updated |
Document Description: Primary Keys for Year 11 2024 is part of Computer for GCSE/IGCSE preparation.
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