text: --4
  SELECT ID, RoomNum, Service, Value
  INTO ServiceLessThan20
  FROM Income
  WHERE Value < 20;
  
  --5
  SELECT *
  INTO IncomeCopy
  FROM Income
  
  --6
  DELETE FROM IncomeCopy
  WHERE (RoomNum = 203 OR RoomNum = 205) AND Date = '2005-01-02';
  
  --7
  UPDATE IncomeCopy
  SET Service = 'fitness'
  WHERE Service LIKE 'sauna';
  
  --8
  UPDATE IncomeCopy
  SET Value = Value + 1;
  
  --9
  UPDATE IncomeCopy
  SET Value = Value - Value * 10 / 100
  WHERE Value > 20;
  
  --10
  UPDATE IncomeCopy
  SET Value = Value - Value * 50 / 100
  WHERE Service = 'fitness' AND Date = '2005-02-02';
  
  --11
  UPDATE IncomeCopy
  SET Date = Getdate();
  
  --12
  TRUNCATE TABLE IncomeCopy;