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我想为我的客户找到最近的员工并更新订单表。我尝试了一个引发错误的查询。任何人都可以建议我的查询做错了什么吗？唯一的选择语句工作正常。但是更新看起来有些不对劲。

我有 3 张桌子

客户_大师

 Customer_ID  Customer_Name   WHID   Cust_Location
    Cust100001   Subash        WH10001  0xE6100000010C1B2E724F57172A408449F1F109685340
    Cust100002   Naresh        WH10002  0xE6100000010CBE30992A18152A4093AAED26F8675340

Employee_Master

Emp_ID      Emp_name   WHID            Emp_Location
Emp100001   Prakash   WH10001    0xE6100000010C363B527DE7172A4069C36169E0675340
Emp100002   Suresh    WH10002    0xE6100000010C98C3EE3B86172A4064E597C118685340
Emp100003   Vincent   WH10001    0xE6100000010CE5B8533A58172A4090DD054A0A685340
Emp100004   Paul      WH10002    0xE6100000010C2EE6E786A6142A40A0A696ADF5675340

Order_Tran

Order_ID           Cust_ID          Emp_ID

ORD19847 Cust100001 ?????
ORD19856 Cust100002 ?????

我在主表中有客户的位置和员工的位置。现在我想更新 Order_Tran 表中最接近 Customer Cust100001 的 Order Table 中客户位置的Emp_ID。

我尝试了以下显示错误的查询

Update Order_Tran Set Emp_ID=(Select Top (1) Emp_ID, Employee_Master.Emp_Location.STDistance(Customer_Master.Cust_Location) AS DistanceApart FROM Customer_Master, Employee_Master WHERE Customer_ID = 'Cust100001'
and Customer_Master.WHID = Employee_Master.WHID  ORDER BY DistanceApart);
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1 回答 1

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尝试在子查询中选择单个值（以停止错误）并添加外部 where 子句（以确保仅更新指定的员工）。

UPDATE Order_Tran 
SET Emp_ID=(SELECT TOP (1) Emp_ID
            FROM Customer_Master, Employee_Master 
            WHERE Customer_ID = 'Cust100001'
            AND Customer_Master.WHID = Employee_Master.WHID  
            ORDER BY Employee_Master.Emp_Location.STDistance(Customer_Master.Cust_Location))
WHERE Customer_ID = 'Cust100001'
于 2013-10-04T15:32:30.453 回答