Question

I have an SQL statement that counts over the total number of rows active packages whose end date is null. I am currently doing this using (x/y) * 100:

SELECT (SELECT COUNT(*) 
          FROM packages 
         WHERE end_dt IS NULL) / (SELECT COUNT(*) 
                                    FROM packages) * 100 
  FROM DUAL;

I wonder if there is a way to make use of any Oracle function to express this more easily?

Answer 1

There’s no functionality I’m aware of, but you could simply the query to be:

SELECT SUM(CASE WHEN p.end_dt IS NULL THEN 1 ELSE 0 END) / COUNT(*) * 100
  FROM PACKAGES p