set verify off

col value head 'Value'
col f1 format 999,999,999 head 'Table #1 | frequency'
col f2 format 999,999,999 head 'Table #2 | frequency'
column product format 999,999,999 head 'Tables join  | frequency | (product)'


break on report skip 1
compute sum of product on report

WITH f1
AS (
	SELECT endpoint_value value
		,endpoint_number - lag(endpoint_number, 1, 0) OVER (
			ORDER BY endpoint_number
			) frequency
	FROM dba_tab_histograms
	WHERE OWNER = '&1'
		AND table_name = '&2'
		AND column_name = '&3'
	ORDER BY endpoint_value
	)
	,f2
AS (
	SELECT endpoint_value value
		,endpoint_number - lag(endpoint_number, 1, 0) OVER (
			ORDER BY endpoint_number
			) frequency
	FROM dba_tab_histograms
	WHERE OWNER = '&4'
		AND table_name = '&5'
		AND column_name = '&6'
	ORDER BY endpoint_value
	)
SELECT f1.value
	,f1.frequency f1
	,f2.frequency f2
	,f1.frequency * f2.frequency product
FROM f1
	,f2
WHERE f2.value = f1.value;