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 | In english: Retrieve current month's usage (using current date/month), retrieve previous month's usage (using previous date/month), subtract current - previous to get difference. table is water_records id, customer_id, water_records_date, water_records_usage 1, '1', '2010-02-01', '226600' 2, '1', '2010-01-01', '223000' 3, '4', '2010-01-05', '5600' 9, '4', '2010-02-19', '88000' 15, '5', '2010-02-15', '10060' … |