How do I determine the distribution of a column's value in Oracle?

Question

For example, if I have a column that represent a Y or N flag, what percentage is a Y and what percentage is an N? I know I can write a query to find each of these numbers and then calculate the percentage myself, but I figure it should be straight forward doing this in PL/SQL with analytic functions like NTILE.

SELECT COUNT(1), enabled_flag
FROM widgets
GROUP BY enabled_flag;

Gives me:

COUNT(1)   | enabled_flag
  123124   | Y
  234234   | N

I need:

enabled_flag | percentage
Y            |         34
N            |         56

Can anyone point me in the right direction?

Answer 1

Try an analytic function as such:

SELECT round(100*COUNT(1)/sum(count(1)) over (),0), enabled_flag
FROM widgets
GROUP BY enabled_flag;

EDIT... you can also use the RATIO_TO_REPORT function which might make it look cleaner or easier to maintain:

SELECT round(100*RATIO_TO_REPORT(count(1)) over (),0), enabled_flag
FROM widgets
GROUP BY enabled_flag;