Question

I need some help in formulating data in Oracle. I will give an example –

I have a Table Customer with Name column.

Customer
  Name
  Ashish
  Amit
  Sunny
  Bob.

I want to get output in the format where names at odd number are adjacent to names at even number; output would be

Customer
Name1     Name2
Ashish    Amit
Sunny     Bob 

and so on…

I tried following query but it doesn’t give me the required output.

select  name, 
  case Mod(rownum,2) 
    when 1  then  name
  end  col1,   
  case Mod(rownum,2) 
    when 0  then  name 
  end  col2
from Customer

Answer 1

This ia basically a PIVOT of the data but Oracle10g does not have the pivot function so you will have to replicate it using an aggregate and a CASE statement. If you apply the row_number() over() as well you can transform the data into the result that you want.

select 
  max(case when col = 1 then name end) Name1,
  max(case when col = 0 then name end) Name2
from
(
  select name,  mod(rownum, 2) col,
    row_number() over(partition by mod(rownum, 2) order by name) rn
  from customer
) 
group by rn

See SQL Fiddle with Demo

Result:

|  NAME1 | NAME2 |
------------------
| Ashish |  Amit |
|  Sunny |   Bob |