Question

I have following tables;

 A   B                       A   B
 _____                       _____
 1   t                       7   a
 2   r                       5   d
 3   e                       3   e
 4   f                       9   a
 5   d                       10  c
 6   s                       11  a
 7   a

And, output should be ;

 A   B                     
 _____                     
 1   t                      
 2   r                     

 4   f

 6   s

 9   a
 10  c
 11  a

In other words I want really different thing. I can only tell with this figure, take a look at. I want (A union B).
How can I do that ?

Answer 1

This query will do it. It loads up all the records from both tables, then displays all those that exist once

SELECT
  A, B
FROM
  (SELECT A, B FROM TABLE1
   UNION ALL
   SELECT A, B FROM TABLE2)
  AS COMBINED
GROUP BY
  A, B
HAVING
    COUNT(*) = 1
ORDER BY A;