Introduction

Microsoft Fabric provides robust security controls for managing data access. For the DP-600 certification exam, mastering Column-Level Security (CLS) is essential to restrict access to specific columns within a table in a Microsoft Fabric Warehouse. In this tutorial, you'll learn how to implement column-level access control to enhance security and compliance while ensuring users have access only to the necessary data.

Column-Level Security

Column-level security (CLS) in Microsoft Fabric Warehouses enables administrators to control access to individual columns within a table. This ensures that sensitive data remains protected while allowing authorized users to access non-sensitive information.

CLS is implemented using column-level permissions in SQL, allowing fine-grained control over user access. Unlike broader table-level security, CLS ensures that users can view only permitted columns while being restricted from accessing sensitive information such as Personally Identifiable Information (PII) or financial data.

Implement Column-Level Security

Column-level security can be managed in a Fabric Warehouse using GRANT, REVOKE, and DENY T-SQL statements. These commands help administrators control user access to specific columns within a table.

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In the following examples, we consider the role data_engineer and table named university.student.

Grant Permissions ✅

The GRANT statement allows a user or role to perform specific actions on a column within a table. Granting select access to specific columns ensures that users can retrieve only the allowed information.

Use the following T-SQL query to grant access to specific columns:

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