Frequency of "Foo Township, Bar County, State" titles

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Frequency is the number of townships sharing a name in different counties of the same state.  Cases is the number of town+state combinations with that frequency.  Townships is their product.  To interpret one row: 74 town+state combinations occur exactly five times, covering 370 townships – for example, five counties of Iowa each have an Adams Township.   The final line shows grand totals of cases and townships.

SQL

WITH Counts AS (
SELECT REGEXP_REPLACE(page_title, ",_.*_County", "") AS TownState, COUNT(*) AS Frequency
FROM page
LEFT JOIN page_props ON pp_page=page_id AND pp_propname="disambiguation"
WHERE page_namespace=0 AND page_is_redirect=0 AND page_title LIKE "%_Township,_%" AND pp_page IS NULL
GROUP BY TownState)
SELECT Frequency, COUNT(*) AS Cases, SUM(Frequency) AS Townships, MIN(TownState) AS Example
FROM Counts
GROUP BY Frequency WITH ROLLUP

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