Question

I have result set like this :

A    B
-------
1    10
2    10
2    10 
3    10
4    10
5    10

I am selecting the values of A corresponding to value of B e.g corresponding to 10 as value of B There are different values of A such as 1, 2, 2, 3, 4, 5.

I want to know that is there a repeated value in A for any value of B. As in this case 2 is repeated so answer in this case is YES.

Answer 1

In standard ANSI SQL you could simply use GROUP BY:

select a, b
  from my_table
 group by a, b
having count(*) > 1

This will return every combination of a and b for which there is more then one row and it will work on every RDBMS specified.