# For every class, posinclass is dense from 1 to maxposinclass,
# apart from the commods for which it is zero.
SELECT commodclass,commodclassid,posinclass,count(*)
# For every class, posinclass is dense from 1 to maxposinclass,
# apart from the commods for which it is zero.
SELECT commodclass,commodclassid,posinclass,count(*)