How to Implement Column-Level Security (CLS) in SQL

Implementing Column-Level Security (CLS)

Write a SQL query to implement column-level security using views.

Solution:

-- Create a view to restrict access to sensitive columns.
CREATE VIEW SecureEmployeeView AS
SELECT EmployeeID, Name
FROM Employees;

-- Grant SELECT permission on the view to a user.
GRANT SELECT ON SecureEmployeeView TO UserD;

Explanation:

• Purpose of the Query :
• The goal is to demonstrate how to implement column-level security by restricting access to sensitive columns.
• Key Components :
• CREATE VIEW: Creates a view that excludes sensitive columns.
• GRANT SELECT: Grants access to the view instead of the underlying table.
• SecureEmployeeView: Provides controlled access to non-sensitive data.
• Why Use Column-Level Security? :
• CLS ensures that users cannot access sensitive data like salaries or SSNs.
• It simplifies compliance with data protection regulations.
• Real-World Application :
• In HR systems, CLS prevents unauthorized access to confidential employee information.

Additional Notes:

• Use views or masking techniques to enforce column-level security.
• Regularly review views to ensure they meet security requirements.
• Important Considerations:
• Ensure that views are up-to-date with schema changes.

For more Practice: Solve these Related Problems:

• Write a SQL query to create a view that hides sensitive columns like salary from the Employees table.
• Write a SQL query to restrict access to the SSN column in the HRData table using column-level security.
• Write a SQL query to create a view that only exposes non-sensitive customer information from the Customers table.
• Write a SQL query to ensure that only authorized users can view the credit card details in the Payments table.

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Previous SQL Exercise: Implementing Row-Level Security (RLS).
Next SQL Exercise: Creating a Database Role and Assigning Permissions.