Question

I have a table where I keep information about financial returns. The columns includes receipts, repairs, service_amount, tyres, fuel, salaries_allowances, others.

I would like to get the cumulative net return like:

Date        Receipts       repairs      service amount  Total costs  net Return
2012-01-10  0.00           120,000.00   0.00            120,000.00   120,000.00
2012-01-12  60,000.00      0.00         0.00            60,000.00    60,000.00

I am currently using this query:

SELECT 
        a.consignment_date, a.receipts, a.service_amount, a.repairs, a.tyres, 
        a.salaries_allowances, a.clearing_fee, a.others, 
        a.service_amount + a.repairs + a.tyres + a.salaries_allowances + a.clearing_fee + a.others as total_costs,
        (b.receipts -(a.service_amount + a.repairs + a.tyres + a.salaries_allowances + a.clearing_fee + a.others)) as netreturn 
FROM 
      vw_local_freight a CROSS JOIN vw_local_freight b 
WHERE 
      a.consignment_date >= b.consignment_date AND a.vehicle_no='123X' 
GROUP BY a.consignment_date

Answer 1

I would look at a query like

SELECT 
    consignment_date.*,
    consignment_date.credits - consignment_date.costs AS totalCosts,
    (@runningTotal := @runningTotal + consignment_date.credits - consignment_date.costs) AS netReturn
FROM (
    SELECT
        consignment_date,
        SUM(receipts) AS credits
        SUM(service_amount + repairs + tyres + salaries_allowances + clearing_fee + others) AS costs
    FROM vw_local_freight 
    WHERE vehicle_no = '123x'
    GROUP BY consignment_date
) AS a, (SELECT @runningTotal := 0) AS b

The subquery tallies up your costs and credits, then the outer query performs your running total. If you need individual column sums within the inner join then they can be added in easily enough.