CASE WHEN - Allows for conditional logic to mask data based on specific conditions but lacks the simplicity for straightforward masking scenarios.

IF ELSE - Suitable for simple conditional checks to mask data but may not efficiently handle complex masking requirements or dynamic role-based access.

COALESCE - Effective for replacing NULL values with a default value but does not provide dynamic masking capabilities based on user roles.

All of the above - When used in combination, these functions can create dynamic views that perform comprehensive data masking based on user roles and permissions, addressing GDPR compliance, performance, and dynamic access requirements.