Query for Identifying column changes

Question

Hi Guys,
Need help in getting a query for my scenario.
I have 2 table Table A and Table B. Both have same columns and data type.
Table A:
Id  PersonId    Name      Code      Date
1    1000           John         M         2014-07-28
2    1001           Mary         B         2014-07-28
3    1002           Robin        R         2014-07-28
4    1003           Maxie        N         2014-07-28
Table B:
Id  PersonId    Name      Code      Date
1    1000           John                     2014-07-28
2    1001           Hary         S         2014-07-28
3    1002           Justin       Q         2012-07-28
4    1003           Maxie       P         2013-07-28
My situation is:
I need to compare both the tables and need to identify the rows that has a change in all columns, if all other columns are not changed and Code is changed to blank, i need to ignore that row.
The expected outcome is:
Id  PersonId    Name      Code      Date
2    1001           Hary         S         2014-07-28
3    1002           Justin       Q         2012-07-28
4    1003           Maxie       P         2013-07-28
Thanks Guys...

Answer 1

I found the solution in a easy way i guess...
select * from 
SELECT ID, PERSONID,NAME,
case when code is null then
    select a.code from tablea A where A.ID = B.ID
else
 a.code
end as Code,
DATE FROM TABLE B
MINUS
SELECT ID,PERSONID,NAME,CODE,DATE FROM TABLE A
What do you guys think...would it work for my scenario....
i am testing few scenarios looks like working.......