Question

我有这些表，关于汽车租赁公司

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我正在尝试获取尚未支付租金的客户列表，以及付款表中没有的客户列表。

这是记录

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这是我尝试使用的查询

select
   Customer.CustNo, 
   name as name, address as address,
   dbo.Car.VehNo as Vehno, 
   dbo.car.model as model,
   dbo.car.condition as 'Before Condition', 
   dbo.car.[Date Registered] as 'Date Registered', 
   dbo.Car.rentalCost as 'rentalCost',
   dbo.Car.brand as brand, 
   dbo.Rental.[Date Reneted] as 'Date Rented', 
   dbo.Rental.[Date Returned] as 'Date Returned',
   dbo.Rental.condition as 'After Condition'
from 
   Customer, Car  
inner join 
   Rental on Customer.CustNo = Rental.CustNo
where 
   dbo.Payment.rentalNo <> dbo.Rental.rentalNo;

但我收到错误

无法绑定多部分标识符

at

Customer.CustNo

和

dbo.Payment.rentalNo

Answer 1

请试试这个。客户与关怀之间的关系是否为CustNo？如果不是，则需要相应地修改连接。

SELECT   cst.CustNo,
         NAME                  AS NAME,
         ADDRESS               AS ADDRESS,
         cr.VehNo              AS Vehno,
         cr.model              AS model,
         cr.condition          AS 'Before Condition',
         cr.[Date Registered]  AS 'Date Registered',
         cr.rentalCost         AS 'rentalCost',
         cr.brand              AS brand,
         rnt.[Date Reneted]    AS 'Date Rented',
         rnt.[Date Returned]   AS 'Date Returned',
         rnt.condition         AS 'After Condition'
FROM     Customer cst
INNER JOIN   Rental rnt
    ON   cst.CustNo = rnt.CustNo
INNER JOIN   Car cr
    ON   cr.VehNo = rnt.VehNo
LEFT OUTER JOIN  Payments pts
    ON   pts.RentalNo = rnt.RentalNo
WHERE    pts.RentalNo IS NULL;

Answer 2

试试这个：

select
    cu.CustNo, cu.name, cu.address,
    ca.VehNo, ca.model,
    ca.condition as 'Before Condition', 
    ca.[Date Registered] as 'Date Registered', 
    ca.rentalCost as 'rentalCost',
    ca.brand, 
    r.[Date Reneted] as 'Date Rented', 
    r.[Date Returned] as 'Date Returned',
    r.condition as 'After Condition'
from Customer cu
inner join Rental r on cu.CustNo = r.CustNo
inner join Car ca on ca.VehNo = r.VehNo
where r.rentalNo not in (select distinct rentalno from payment)

左连接方法也可以使用，但使用IN可能会提供更好的性能。

编辑：添加了一个简短的解释。

首先，您选择了所需的列（SELECT部分），指定它们彼此之间的关系（INNER JOIN），最后指定您希望RentalNo不存在于其中的所有行付款表（表示缺少付款的行 - NOT IN子句）。

列别名的使用是可选的，它们只是用于缩短查询（并且可能更容易阅读）。该查询可能也被声明为：

select
    Customer.CustNo, name, address,
    Car.VehNo, model,
    Car.condition as 'Before Condition', 
    [Date Registered] as 'Date Registered', 
    rentalCost,
    brand, 
    [Date Reneted] as 'Date Rented', 
    [Date Returned] as 'Date Returned',
    Rental.condition as 'After Condition'
from Customer
inner join Rental  on customer.CustNo = rental.CustNo
inner join Car on car.VehNo = rental.VehNo
where Rental.rentalNo not in (select distinct rentalno from payment)

您需要指定 Table.Column 的唯一时间是在查询中的多个表中存在具有相同名称的列时 - 您必须限定从哪个表中获取数据。此外，只有当您想要更改显示的列的名称/标题时才需要使用作为“新列名称”，使用name as name毫无意义。

SQL查询加入多部分标识符

2 个答案: