No is correct. Running Set-AzSqlDatabaseDataMaskingPolicy with the DatabaseName set to 'Aquila' will not by itself create a mask on the Clients.contact_email column.

The Set-AzSqlDatabaseDataMaskingPolicy cmdlet configures the database level dynamic data masking policy and its overall state, but it does not add per column masking rules. To hide values in the contact_email column you must create a column level masking rule that specifies the schema, table, column, and masking function. You can add that rule with the Azure PowerShell command that manages masking rules or by using T SQL to define a mask on the specific column.

Yes is incorrect because enabling or setting the database policy alone does not create the per column rule needed to mask the contact_email values. Without a column level rule the email data will remain unmasked.

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