Revoking the privileges for selecting and inserting into the table (or view) SALES

REVOKE SELECT, INSERT ON TABLE SALES
  FROM USER ALEX;

Revoking the privilege for selecting from the CUSTOMER table from the MANAGER and ENGINEER roles and from the user IVAN:

REVOKE SELECT ON TABLE CUSTOMER
  FROM ROLE MANAGER, ROLE ENGINEER, USER IVAN;

Revoking from the ADMINISTRATOR role the privilege to grant any privileges on the CUSTOMER table to other users or roles:

REVOKE GRANT OPTION FOR ALL ON TABLE CUSTOMER
  FROM ROLE ADMINISTRATOR;

Revoking the privilege for selecting from the COUNTRY table and the privilege to reference the NAME column of the COUNTRY table from any user, via the special user PUBLIC:

REVOKE SELECT, REFERENCES (NAME) ON TABLE COUNTRY
  FROM PUBLIC;

Revoking the privilege for selecting form the EMPLOYEE table from the user IVAN, that was granted by the user ALEX:

REVOKE SELECT ON TABLE EMPLOYEE
  FROM USER IVAN GRANTED BY ALEX;

Revoking the privilege for updating the FIRST_NAME and LAST_NAME columns of the EMPLOYEE table from the user IVAN:

REVOKE UPDATE (FIRST_NAME, LAST_NAME) ON TABLE EMPLOYEE
  FROM USER IVAN;

Revoking the privilege for inserting records into the EMPLOYEE_PROJECT table from the ADD_EMP_PROJ procedure:

REVOKE INSERT ON EMPLOYEE_PROJECT
  FROM PROCEDURE ADD_EMP_PROJ;

Revoking the privilege for executing the procedure ADD_EMP_PROJ from the MANAGER role:

REVOKE EXECUTE ON PROCEDURE ADD_EMP_PROJ
  FROM ROLE MANAGER;

Revoking the privilege to grant the EXECUTE privilege for the function GET_BEGIN_DATE to other users from the role MANAGER:

REVOKE GRANT OPTION FOR EXECUTE
  ON FUNCTION GET_BEGIN_DATE
  FROM ROLE MANAGER;

Revoking the EXECUTE privilege on the package DATE_UTILS from user ALEX:

REVOKE EXECUTE ON PACKAGE DATE_UTILS
  FROM USER ALEX;

Revoking the USAGE privilege on the sequence GEN_AGE from the role MANAGER:

REVOKE USAGE ON SEQUENCE GEN_AGE
  FROM ROLE MANAGER;

Revoking the USAGE privilege on the sequence GEN_AGE from the trigger TR_AGE_BI:

REVOKE USAGE ON SEQUENCE GEN_AGE
  FROM TRIGGER TR_AGE_BI;

Revoking the USAGE privilege on the exception E_ACCESS_DENIED from the package PKG_BILL:

REVOKE USAGE ON EXCEPTION E_ACCESS_DENIED
  FROM PACKAGE PKG_BILL;

Revoking the privilege to create tables from user JOE:

REVOKE CREATE TABLE
  FROM USER Joe;

Revoking the privilege to alter any procedure from user JOE:

REVOKE ALTER ANY PROCEDURE
  FROM USER Joe;

Revoking the privilege to create databases from user SUPERUSER:

REVOKE CREATE DATABASE
  FROM USER Superuser;

Revoking the DIRECTOR and MANAGER roles from the user IVAN:

REVOKE DIRECTOR, MANAGER FROM USER IVAN;

Revoke from the user ALEX the privilege to grant the MANAGER role to other users:

REVOKE ADMIN OPTION FOR MANAGER FROM USER ALEX;

Revoking all privileges (including roles) on all objects from the user IVAN:

REVOKE ALL ON ALL
  FROM USER IVAN;

Revoking the DEFAULT property of the DIRECTOR role from user ALEX, while the role itself remains granted:

REVOKE DEFAULT DIRECTOR
  FROM USER ALEX;