-- q4b
UPDATE DT951
SET 
  DI010459 = add_months(DI010459 , 2000 * 12)
WHERE 
  TO_NUMBER(TO_CHAR(DI010459, 'YYYY')) < 1970;
UPDATE DT951
SET 
  DI010460 = add_months(DI010460 , 2000 * 12)
WHERE 
  TO_NUMBER(TO_CHAR(DI010460, 'YYYY')) < 1970;
-- q5b
UPDATE DT478
SET 
  DI000622 = add_months(DI000622 , 2000 * 12)
WHERE 
  TO_NUMBER(TO_CHAR(DI000622, 'YYYY')) < 1970;
UPDATE DT478
SET 
  DI000623 = add_months(DI000623 , 2000 * 12)
WHERE 
  TO_NUMBER(TO_CHAR(DI000623, 'YYYY')) < 1970;
-- q6b
UPDATE DT002
SET 
  DI024786 = add_months(DI024786 , 2000 * 12)
WHERE 
  TO_NUMBER(TO_CHAR(DI024786, 'YYYY')) < 1970;
UPDATE DT002
SET 
  DI024787 = add_months(DI024787 , 2000 * 12)
WHERE 
  TO_NUMBER(TO_CHAR(DI024787, 'YYYY')) < 1970;
-- q7b
UPDATE DT901
SET 
  DI005503 = add_months(DI005503 , 2000 * 12)
WHERE 
  TO_NUMBER(TO_CHAR(DI005503, 'YYYY')) < 1970;
UPDATE DT901
SET 
  DI005504 = add_months(DI005504 , 2000 * 12)
WHERE 
  TO_NUMBER(TO_CHAR(DI005504, 'YYYY')) < 1970;