How to get a table with unique id in middle and compare?

I have a following table in the datasource

ID               item

1                   abc

2                    def

3                    efg

4                    ghi

5                    jkl

1                   abc

2                     def

3                    pqr

4                    xyz

I want following result table

item               ID                         Item

abc                   1                          abc

def 2 def

efg                    3                         pqr

ghi                    4                          xyz

How do i get this?