Question

我有一个客户表和一个地址表，每个客户在地址表中应该有多个地址我需要一个存储过程来从地址表的顶部选择客户详细信息及其地址选择客户的参数是companyID

SELECT top 1  s.Addr1 as ShipAddress_Addr1,s.Addr2 as  ShipAddress_Addr2,s.Addr3 as ShipAddress_Addr3,
    s.Addr4 as ShipAddress_Addr4,s.Addr5 as ShipAddress_Addr5,
    s.City as ShipAddress_City,s.[state] as ShipAddress_State,s.PostalCode as ShipAddress_PostalCode,
    s.Country as ShipAddress_Country,s.Note as ShipAddress_Note ,c.CustomerID,c.[TimeCreated], c.[FullName],c.FirstName,c.LastName,c.Phone, c.Email, 
    c.BillAddress_Addr1, c.[BillAddress_Addr2],c. [BillAddress_Addr3],c. [BillAddress_Addr4],c.[BillAddress_Addr5],
     c.BillAddress_City,c.BillAddress_State,c.BillAddress_PostalCode,c.BillAddress_Country,c.BillAddress_Note
        FROM   Customer c left join [dbo].[CustomerShipToAddress] s on s.customerListID=c.CustomerID    
    WHERE c.IsActive = 1 and c.CompanyID = @CompanyID

Answer 1

您可以像这样outer apply为每个客户提供最新地址：

select c.customerid, c.name, c.accno, c.txnid, ta.add1, ta.add2
from customertable c
outer apply (select top 1 a.add1, a.add2 from addresstable a where a.customerid = c.customerid order by a.addressid desc) ta

外部的子查询始终为每个客户返回0或1行，因此当您与customertable联接时，不会导致行的重复。

Answer 2

SELECT TOP 1, c.customerid, c.name, a.add1  FROM customertable c, addresstable a WHERE c.customerid == a.customerid

这将基本上返回第一行。这就是您要的，但我想的不是您的意思。

如果要查找此信息以供特定客户使用

SELECT TOP 1, c.customerid, c.name, a.add1  FROM customertable c, addresstable a WHERE c.customerid == a.customerid AND c.customerid == "yourcustomerid"

甚至

SELECT c.customerid, c.name, DISTINCT a.add1  FROM customertable c, addresstable a WHERE c.customerid == a.customerid

sql server join并选择前1个

2 个答案: