I'm having the data in format given below.
Col1  |  Col2
_______________
item1 | orange 
item2 | apple
item1 | guava
item2 | noodles
...
I want data to be in below format.
item1  |  item2
_______________
orange |  apple
guava  |  noodles
...
I'm using PostgreSQL 9.1.
Is it possible to do it in single SQL query?
