Question

如何根据左表中的列总和

从另一个表中选择一行

SELECT Group_concat(c.cartid SEPARATOR ',') AS CartIDs, 
       Sum(c.grandtotal)                    AS Sum, 
       r.percentage 
FROM   carts c 
       LEFT JOIN rebates r 
              ON Sum(c.grandtotal) >= r.fromamountpurchased 
                 AND Sum(c.grandtotal) <= r.toamountpurchased 
WHERE  c.ispaid = '1' 
       AND c.addedtorebates = '0' 
GROUP  BY c.customerid

但这不起作用。我也试过HAVING也行不通。

是否可以在一个查询中使用？

谢谢！

更新

CREATE TABLE IF NOT EXISTS `carts` (
  `CartID` bigint(20) NOT NULL AUTO_INCREMENT,
  `CustomerID` bigint(20) NOT NULL,
  `GrandTotal` decimal(10,2) NOT NULL,
  `IsPaid` enum('0','1','2') NOT NULL,
  `AddedToRebates` enum('0','1') NOT NULL,
  PRIMARY KEY (`CartID`)
)

    INSERT INTO `carts` (`CartID`, `CustomerID`, `GrandTotal`,  `IsPaid`,
    `AddedToRebates`, ) VALUES
    (71, 28,  '57450.00', '1', '0' ),
    (73, 28,  '57450.00', '1', '0');



CREATE TABLE IF NOT EXISTS `rebates` (
  `RebateID` bigint(20) NOT NULL AUTO_INCREMENT,
  `Percentage` varchar(255) NOT NULL COMMENT 'in %',
  `FromAmountPurchased` decimal(10,2) NOT NULL,
  `ToAmountPurchased` decimal(10,2) NOT NULL,
  `CashEquivalent` decimal(10,2) NOT NULL,
  PRIMARY KEY (`RebateID`)
)



 INSERT INTO `rebates` (`RebateID`, `Percentage`, `FromAmountPurchased`, 
`ToAmountPurchased`, `CashEquivalent`) VALUES
    (1, '5', '50000.00', '69999.00', '3000.00'),
    (2, '10', '70000.00', '79999.00', '5000.00'),
    (3, '15', '80000.00', '89999.00', '6000.00'),
    (4, '20', '90000.00', '99999.00', '7000.00'),
    (5, '25', '100000.00', '150000.00', '8000.00'),
    (6, '0', '0.00', '49999.00', '0.00');

Answer 1

试试这个：

select q1.CartIDs, q1.total, r.percentage
  from
    (select group_concat(c.cartid) as CartIDs, sum(c.grandtotal) as total
      from carts c
        where c.ispaid = '1'
        and c.addedtorebates = '0'
      group by c.customerid ) q1
    left join rebates r
      on q1.total >= r.fromamountpurchased 
        and q1.total <= r.toamountpurchased

以下是您的演示小提琴：http://sqlfiddle.com/#!9/d27f5/3

您不能在连接谓词中使用SUM()之类的聚合函数，因此在本例中，子查询很有用

Answer 2

您可以使用子查询来实现结果。请注意，此子查询需要额外扫描购物车。

SELECT GROUP_CONCAT(c.CartID SEPARATOR ',') AS CartIDs, SUM(c.GrandTotal) as Sum, r.Percentage 
FROM carts c
INNER JOIN (
  SELECT SUM(GrandTotal) as grandTotal, CustomerID
  FROM carts
  GROUP BY CustomerID
) cSums ON cSums.CustomerID = c.CustomerID
LEFT JOIN rebates r ON cSums.grandTotal >= r.FromAmountPurchased AND cSums.grandTotal <= r.ToAmountPurchased
WHERE c.IsPaid = '1' AND c.AddedToRebates = '0' GROUP BY c.CustomerID

Mysql将列的总和与另一个表中的列进行比较

2 个答案: