Question

The common fields used in a relationship between tables are called

• A. Joint fields
• B. Main fields
• C. Table fields
• D. Key fields

Answer 1

The Correct Option is D

In the context of relational databases, when we create a relationship between tables, the common fields used are known as Key fields. Key fields, especially primary keys and foreign keys, play a crucial role in ensuring data integrity and establishing connections between two or more tables.

Here's a brief explanation:  

• Primary Key: A unique identifier for each record in a table. It ensures that no two rows have the same key, maintaining uniqueness.
• Foreign Key: A field (or fields) in one table that uniquely identifies a row of another table or the same table. It creates a link between the two tables.

Effective use of key fields is essential for creating a robust database structure, as they help maintain referential integrity by ensuring that relationships between tables remain consistent.

Answer 2

In a relational database system, key fields are used to establish and identify relationships between different tables. These fields uniquely identify records in a table, and their commonality in two tables forms the basis of the relationship between them.

• Joint fields: are not a standard term used in relational databases.
• Main fields: refer to fields in a table that are important but do not necessarily function as key fields in relationships.
• Table fields: are simply the individual columns in a table and are not specific to relationships.
• Key fields: are the correct term. These fields in one table correspond to the primary key or foreign key fields in another table, allowing the database system to create relationships between them.

Thus, the correct answer is: Key fields