Inserting records in a table after iterating through it

Question

Hi,
I have a table like this:
Col 1 Col 2
1 rat
2 hen
1 dog
1 cat
3 lion
My requirement is to process all the records with unique values in col 1, means I will be inserting these unique records in table A and if the record repeats like for values in Col 1, we have duplicates 1,1,1. these duplicate values will be inserted in table B. Only one value will go in table A out of all the duplicates and other two duplicate values will get inserted in table B.
All this needs to be done using a SQL query. I can't use procedure, function or any other database object. I should use only SQL query.
Could anyone help me in designing this?
PS: Am a java developer with basic knowledge of PL/SQL.
Thanks.

Answer 1

Centinul wrote:
Hope this helps!Based on "other two duplicate values will get inserted in table B" it should be:
INSERT ALL
     WHEN rn = 1 THEN
          INTO a (col1, col2) VALUES (col1, col2)
     WHEN rn != 1  THEN
          INTO b (col1, col2) VALUES (col1, col2)
SELECT col1
     , col2
     , ROW_NUMBER() OVER (PARTITION BY col1 ORDER BY col2) AS rn
FROM   table_x
;SY.