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feen uren Methode: revisies per dag per pagina SELECT field2 AS page_title, substr(field4,1,7) AS maand, -- pakt YYYY-MM COUNT(*) AS aantal_revisies FROM feenaw GROUP BY page_title, maand ORDER BY maand ASC, page_title ASC; Alarm systeem B2021-101Alert Personenalarmering2021-104Beveiliging bericht2021-1019Camera…