Final Answer:
Business rules are statements that define or constrain aspects of a business. Examples include: 1) A referential constraint must refer to the primary key of the parent table. 2) An employee must be at least 18 years old. 3) A database query eliminates columns an employee should not see. 4) Employees below pay grade 6 are not permitted to modify orders.
Step-by-step explanation:
Business rules play a crucial role in maintaining data integrity and guiding organizational processes. In the given examples:
1. Referential Constraint: The first rule ensures database integrity by specifying that a referential constraint must point to the primary key of the parent table. This promotes consistency and accuracy in relational databases, preventing data anomalies.
2. Age Requirement: The second rule sets a minimum age requirement for employees. This is vital for compliance and ethical reasons, ensuring that individuals in the workforce are legally eligible and capable of handling responsibilities associated with their roles.
3. Data Security: The third rule addresses data security by restricting certain columns from being visible to employees in a database query. This helps protect sensitive information and ensures that employees only access data relevant to their roles.
4. Access Control: The fourth rule defines access control by specifying that employees below pay grade 6 are not allowed to modify orders. This safeguards against unauthorized modifications and maintains a structured hierarchy within the organization.
In summary, these business rules serve as guidelines, promoting data accuracy, integrity, and adherence to legal and organizational standards. They contribute to the efficient functioning of systems and processes within a business environment.