Question

我有这张表：

WS | Cat | Prod | CS | Dis| UserWS | MarA | ModA | MarU | BCIU

我需要加入它们以获得所有行关系，即使有些是空的，我试过这个：

Select *
FROM WS 
Left join MarU on MarU.Code=WS.used_brand
Left join Prod p on p.MarA=Cat.OID 
Left join CS on WS.CS =CS.OID  
Left join Prod pp on WS.product_code=pp.Code 
Left join MarA on WS.customer_car_brand=MarA.Code 
Left join ModA on WS.customer_car_model=ModA.Code
Left join CS c on c.UserWS=UserWS.Oid 
Left join CS css on css.Dis=Dis.OID
Left join BCIU on BCIU.Code=WS.used_bci

当我运行它时，我收到此错误：

[Err] 42000 - [SQL Server]多部分标识符“Cat.OID”可以不受约束。 42000 - [SQL Server]多部分标识符 “UserWS.Oid”无法绑定。 42000 - [SQL Server]多部分标识符“Dis.OID”无法绑定。 42000 - [SQL Server] 无法绑定多部分标识符“Cat.Name”。 42000 - [SQL 服务器]无法绑定多部分标识符“Prod.Name”。 42000 - [SQL Server]无法绑定多部分标识符“Dis.Nombre”。 42000 - [SQL Server]多部分标识符“UserWS.Nombre” 无法受约束。 42000 - [SQL Server]多部分标识符 “Cat.Segmento”无法受约束。

我缺少什么？

Answer 1

首先，简化查询，以隔离错误。你会得到同样的错误：

SELECT *
FROM WS Left join
     MarU
     on MarU.Code = WS.used_brand Left join
     Prod p
     on p.MarA = Cat.OID

如错误所示，Cat未定义。这不是前向引用问题，因为Cat未在FROM子句中的任何位置定义。大概，你刚刚省略了相关的表/视图。

Answer 2

您的错误消息实际上是多个错误。我轮流对付他们。

查看以-->开头的行：

[Err] 
42000 - [SQL Server]The multi-part identifier "Cat.OID" could not be bound.
 --> Your SQL doesn't mention JOIN Cat table anywhere

42000 - [SQL Server]The multi-part identifier "UserWS.Oid" could not be bound. 
 --> Your SQL doesn't mention JOIN UserWS table anywhere

42000 - [SQL Server]The multi-part identifier "Dis.OID" could not be bound. 
 --> Your SQL doesn't mention JOIN Dis table anywhere

42000 - [SQL Server]The multi-part identifier "Cat.Name" could not be bound. 
 --> Your SQL doesn't mention JOIN Cat table anywhere

42000 - [SQL Server]The multi-part identifier "Prod.Name" could not be bound. 
 --> Your SQL doesn't call the Prod table "Prod", it joins it twice and aliases it as "p" and "pp". refer to p.Name or pp.Name, not Prod.Name

42000 - [SQL Server]The multi-part identifier "Dis.Nombre" could not be bound. 
 --> Your SQL doesn't mention JOIN Dis table anywhere

42000 - [SQL Server]The multi-part identifier "UserWS.Nombre" could not be bound. 
 --> Your SQL doesn't mention JOIN UserWS table anywhere

42000 - [SQL Server]The multi-part identifier "Cat.Segmento" could not be bound.
 --> Your SQL doesn't mention JOIN Cat table anywhere

Answer 3

Left join Prod p on p.MarA=Cat.OID

上述语句中的cat必须是Table或Table别名，但您的语句中没有表或别名，只有Cat。

事先添加LEFT JOIN CAT on [ForeignKey]=CAT.[PrimaryKey]。

左连接无法绑定

3 个答案: