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/*
verify the number of records before doing any joining - 135
*/
SELECT 
  T.EMPLOYEE_ID,
  T.TIME_CODE,
  T.END_DTTM,
  T.UNIT_ID,
  T.NP_TIME_CODE,
  T.JUSTIFY
FROM employee_times T
WHERE T.unit_id    IN ('512')
AND ( T.END_DTTM    = TO_DATE('12-24-12','mm-dd-yy')
OR T.END_DTTM       = TO_DATE('12-25-12','mm-dd-yy')
OR T.END_DTTM       = TO_DATE('12-31-12','mm-dd-yy')
OR T.END_DTTM       = TO_DATE('01-01-13','mm-dd-yy') )
ORDER BY T.End_Dttm;

/*
now run with the join, number of records should be the same - 135
*/
SELECT E.Last_Name
  || ', '
  || E.First_Name AS EMPLOYEE,
  T.EMPLOYEE_ID,
  T.TIME_CODE,
  T.END_DTTM,
  T.UNIT_ID,
  T.NP_TIME_CODE,
  T.JUSTIFY
FROM employee_times T
LEFT JOIN
  (SELECT DISTINCT employee_id,
    last_name,
    first_name
  FROM employee_profile
  WHERE unit_id = '512'
  ) E
ON E.Employee_Id    = T.Employee_Id
WHERE T.unit_id    IN ('512')
AND ( T.END_DTTM    = TO_DATE('12-24-12','mm-dd-yy')
OR T.END_DTTM       = TO_DATE('12-25-12','mm-dd-yy')
OR T.END_DTTM       = TO_DATE('12-31-12','mm-dd-yy')
OR T.END_DTTM       = TO_DATE('01-01-13','mm-dd-yy') )
ORDER BY E.Last_Name, E.First_Name, T.End_Dttm;