Hello, I'd like to write a histogram-like query that shows these columns: - x-value from 0 to k. - number of rows with that x-value. - number of rows seen so far (i.e. with the current x-value or less). - % of total rows seen so far.
The following query works for the first three columns, but the last column gives me an error: SELECT c, COUNT(*) AS items_count, SUM(COUNT(*)) OVER (ORDER BY c) AS total_items_count, SUM(COUNT(*)) OVER (ORDER BY c) / SUM(COUNT(*)) AS total_items_perc FROM (SELECT p.id, COUNT(*) c FROM parent p, child ch WHERE p.id = ch.parent_id GROUP BY p.id ) x GROUP BY x.c ORDER BY x.c Including that fourth SELECT column gives me this error: ERROR: aggregate function calls cannot be nested Is there any way to get % of total in a query like this? Thanks, Paul -- _________________________________ Pulchritudo splendor veritatis.