Question

I have 3 columns in Oracle database having table mytable and i want records having only duplicate values in 2nd and 3rd column.

SQL> select * from mytable ;

column1      column2       column3

  A            50           50----required output
  A            10           20----have different values i.e. 10 and 20
  A            50           50----required output
  A            30           70----have different values i.e. 30 and 70
  B            20           20----required output
  B            40           30----have different values i.e. 40 and 30

I want the following output with count(*):

 column1      column2       column3

  A            50           50
  A            50           50
  B            20           20

Any help is much appreciated

Answer 1

select column1, count (*)
from mytable
where column2 = column3
group by column1, column2;