mysql - 如何在此 mysql 查询中创建 RUNNING TOTAL

Question

select saleid, orderno, orderdate, 
    sum(purchaseprice+purchaseshipping+paypalfee+storefee) as totalcost, 
    customerpaid as totalrevenue, 
    (customerpaid - sum(purchaseprice+purchaseshipping+paypalfee+storefee)) as profit,
    ROUND((((customerpaid - sum(purchaseprice+purchaseshipping+paypalfee+storefee)) / customerpaid) * 100.00),2) as profitmargin
from tblsales 
group by orderno having " . $having . " 
order by $sort $order limit $offset,$rows

这个查询工作正常。有没有一种方法可以将running total profit 字段添加到此查询，以执行已在查询中计算的profit 的运行总和？

Answer 1

只需将其放入子查询并使用变量即可:

select t.*,
       (@cumesum := @cumesum + profit) as runningprofit
from (select saleid, orderno, orderdate, 
             sum(purchaseprice+purchaseshipping+paypalfee+storefee) as totalcost, 
             customerpaid as totalrevenue, 
             (customerpaid - sum(purchaseprice+purchaseshipping+paypalfee+storefee)) as profit,
             ROUND((((customerpaid - sum(purchaseprice+purchaseshipping+paypalfee+storefee)) / customerpaid) * 100.00),2) as profitmargin
      from tblsales 
      group by orderno
      having " . $having . " 
     ) t cross join
     (select @cumesum := 0) vars
order by $sort $order
limit $offset, $rows;