text: --
  -- Copyright 2010-2017 Boxfuse GmbH
  --
  -- Licensed under the Apache License, Version 2.0 (the "License");
  -- you may not use this file except in compliance with the License.
  -- You may obtain a copy of the License at
  --
  --         http://www.apache.org/licenses/LICENSE-2.0
  --
  -- Unless required by applicable law or agreed to in writing, software
  -- distributed under the License is distributed on an "AS IS" BASIS,
  -- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  -- See the License for the specific language governing permissions and
  -- limitations under the License.
  --
  
  CREATE TABLE Emp_tab
  (
    sal    INTEGER,
    Empno  INTEGER
  );
  
  CREATE OR REPLACE TRIGGER Print_salary_changes
    BEFORE DELETE OR INSERT OR UPDATE ON Emp_tab
    FOR EACH ROW
  WHEN (new.Empno > 0)
  DECLARE
      sal_diff number;
  BEGIN
      sal_diff  := :new.sal  - :old.sal;
      dbms_output.put('Old salary: ' || :old.sal);
      dbms_output.put('  New salary: ' || :new.sal);
      dbms_output.put_line('  Difference ' || sal_diff);
  END;
  /
  
  create or replace trigger nls_sort_settings
  after logon on schema
  begin
  EXECUTE IMMEDIATE 'ALTER SESSION SET NLS_SORT=BINARY_CI';
  end nls_sort_settings;
  /