Data Updates

Please through your views on the below Issue-

There is a Emp table in the DB. Every day the file will be getting updated. Once the data in the Emp table gets updated, the table contains only updated data. For few columns if there might be no updations based on the source data. The Issue is we needs to find a way which tells us which column value got updated.

Example:-

Emp_Table
-------------

Update Emp_Table
set
A.Emp_ID=B.Emp_ID,
A.EMP_Name=A.EMP_Name,
A.SSN=B.SSN,
A.ADDRESS=B.ADDRESS,
A.GENDER=B.GENDER,
---
---
---
---
A.STATUS=B.STATUS
from Emp_Table A, Emp_source B
where A.Emp_ID=B.Emp_ID

Note: One thing needs note is some times Emp_source may comes with 4 to 5 days of updates with a date column. Every change needs to be captured like, which columns are getting updated. After Emp_Table gets updated, this table contains only one record per Emp_ID.

Hopes this will be little tricky. Help me with sample script.

Thanks in Advance.

-Balas