CREATE OR REPLACE PROJECTION POLICY my_prj_policy 
  AS () RETURNS PROJECTION_CONSTRAINT -> PROJECTION_CONSTRAINT(ALLOW => false); 
 
ALTER TABLE my_table 
  MODIFY COLUMN email_address SET PROJECTION POLICY my_prj_policy; 
 
The above code reflects the following effects that are provided for this column: 
•	You can use the column “email_address” in WHERE clauses and joins, and you can filter records based on specific values. 
•	You cannot use the column “email_address” in a SELECT clause. It cannot be printed in query results and is prevented from being inserted into another table.