Question

我有两张桌子，我想加入。一个包含客户，名为“客户”。另一张表“Customeraccounts”。表格与客户ID有关。像这样。

Customers
1, john, Smith

CustomerAccounts
1, 1, 12345678
2, 1, 98765432

如何将表连接到输出将是：

1, john, smith, 12345678, 98765432

Answer 1

SELECT * FROM Customer RIGHT OUTER JOIN CustomerAccounts
ON Customer.customer_id=CustomerAccounts.customer_id;

Answer 2

也许这对你有用：

SELECT Customers.Id, 
       Customers.LastName, 
       Customers.FirstName,
       STUFF((SELECT ',' + CustomerAccounts.Number
              FROM CustomerAccounts
              WHERE CustomerAccounts.CustomerId = Customers.Id
         FOR XML PATH('')
        ),1,1,'') 
       AS AllCustomerAccounts   
FROM Customers

Answer 3

在 MySQL 中，您可以

SELECT 
  Cust.ID
  , Cust.Forname
  , Cust.Name
  , GROUP_CONCAT(Acc.Number) as AccNumber
FROM CustomerAccount Acc 
INNER JOIN Customers Cust ON Acc.ID_Customer = Cust.ID 
GROUP BY Cust.id

在 SQL服务器中，您需要对其进行一些调整并执行以下操作：

SELECT     
  Cust.ID,
  , Cust.Forname  
  , Cust.Name
  , AccNumber = replace                           
     ((SELECT A2.number AS [data()]                               
       FROM CustomerAccount A2 
       INNER JOIN Customers C2 ON A2.ID_Customer = C2.ID
       WHERE Cust.id = C2.id  
       ORDER BY A2.number FOR xml path('')), ' ', REQUIRED SEPERATOR) 
FROM CustomerAccount Acc  
INNER JOIN Customers Cust ON Acc.ID_Customer = Cust.ID 
GROUP BY Cust.id, cust.Forname, cust.Name

另请参阅此问题：Simulating group_concat MySQL function in Microsoft SQL Server 2005?

Answer 4

Select
Acc.ID,
Cust.Forname,
Cust.Name,
Acc.Number

From CustomerAccount Acc
Inner Join Customers Cust
On Acc.ID_CUstomer = Cust.ID

我认为你的专栏是

CustomerAccount ID | ID_Customer |编号

客户 ID |的forName |名称

我认为它会起作用

用sql连接表

4 个答案: