Question

I have a table named Datatable. and it has a column named data.

data  
-------
10       
20    
30

i need to get a column as

data  
-------
10/60   
20/60   
30/60  

i wrote the query as

select data/sum(data) 
  from datatable;

Answer 1

Using the window function sum over the entire table (over ()):

select  1.0 * data / sum(data) over ()
from    tableName

Example at SQL Fiddle.