Select the latest information

Oracle 10g

I have major paintings and Archives of the tables (the data are transferred from hand to check after some time).
I have therefore three cases here

1. the data will be present in the main tables until it is proposed to check in.
2. the data will be presented in the tables of archive if no data is found in the tables of archive
3. the data will be present in the main tables and tables of archive (IE once the data for archiving of the record movement may have received some updtaes
in this case archive aura of the old data and main table will have new data. )

so, a specific key, I have to select only the most up-to-date information. Please help me.

with emp as(select 100 emp_no, 10 dept_no from dual Union all
select 300 emp_no, 10 dept_no from dual
 )
,emp_details as (select 100 emp_no , 'Matt Wenzel' emp_name, '00000' ssn from dual Union all 
select 300 emp_no , 'Greg' emp_name, '1111' ssn from dual
),
emp_arc as 
(select 100 emp_no, 10 dept_no from dual Union all
select 200 emp_no,  10 dept_no from dual
)
,emp_details_arc as (select 100 emp_no , 'Matt' emp_name, '00000' ssn from dual Union all 
select 200 emp_no , 'David' emp_name, '2222' ssn from dual 
)
select * from emp a, emp_details b,
emp_arc c, emp_details_arc d
where a.emp_no = b.emp_no
and c.emp_no = d.emp_no;

o/p required 
---------------------
select 100 emp_no , 'Matt Wenzel' emp_name, '00000' ssn from dual union all 
select 300 emp_no , 'Greg' emp_name, '1111' ssn from dual union all 
select 200 emp_no , 'David' emp_name, '2222' ssn from dual

Hello

Thank you for providing the sample data in a useful form. It is very useful.

new learner wrote:
o/p required
---------------------

select 100 emp_no , 'Matt Wenzel' emp_name, '00000' ssn from dual union all
select 300 emp_no , 'Greg' emp_name, '1111' ssn from dual union all
select 200 emp_no , 'David' emp_name, '2222' ssn from dual

Is this really the output you want, or do you want the output below?
If you want that the output below, why not display the output below?

    EMP_NO EMP_NAME    SSN
---------- ----------- -----
       100 Matt Wenzel 00000
       200 David       2222
       300 Greg        1111

Here's a way to get the result of the latter:

WITH  unified_data     AS
(
     SELECT     emp_no, emp_name, ssn
     ,     1     AS source_table
     FROM     emp_details
--     JOIN     emp ...          -- if needed
          --
    UNION ALL
          --
     SELECT     emp_no, emp_name, ssn
     ,     2     AS source_table
     FROM     emp_details_arc
--     JOIN     emp_arc     ...     -- if needed
)
,     got_r_num     AS
(
     SELECT  emp_no, emp_name, ssn
     ,     ROW_NUMBER () OVER ( PARTITION BY  emp_no
                         ORDER BY      source_table
                       )     AS r_num
     FROM     unified_data
)
SELECT     emp_no, emp_name, ssn
FROM     got_r_num
WHERE     r_num     = 1
;

Essentially, it is a Request Top - N , where you want to take the lines N (N = 1 in this case) from the top of an ordered list. The tricky part here receives the data from two tables combined as if they were one. (I say two tables, not four, because emp and emp_arc are not needed for the output you posted. If they were needed, then you may reach them at emp_details and emp_details_arc inside the sub-0query, called unified_data, as indicated by the comments.)

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