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select C.Ow_id, month (t.cash_dt) as month_of_cash, sum(t.POS) as sum_pos FROM Clients C JOIN Transactions T ON T.Ow_id = C.Ow_id where CASH_DT between ADD_MONTHS (TRUNC(SYSDATE), -2) and ADD_MONTHS (TRUNC(SYSDATE), -1) group by C.Ow_id, month (c.cash_dt)

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