Question

我有一个＆＃34;员工＆＃34;表。我有一个＆＃34; Team＆＃34;包含四列的表，每列包含一个int ID。每个ID代表一名员工。（垃圾数据可能来自Northwind数据库）

我想做一个Query，它返回一个带有ID的表和Employee数据的串联。我已经能够使用CoordinatorID，但不知道如何获得多个列。

我想为EstimatorID，ProjectManagerID和＆amp ;;的CoordinatorID做些什么。 MarketingSalesmanID。

我无法上传和映像，但是有一个指向我的SQL Server窗口图像的链接，这有助于澄清我想要做的事情。

另外，我怀疑无论如何我都是这么做的。所以如果有人能告诉我一个我可以学习的例子，我会非常感激。我不介意从头开始......简单的例子是值得赞赏的。我还在学习......

员工数据库

ID FirstName LastName Title

1 Nancy Davolio销售代表

2 Andrew Fuller销售副总裁

3 Janet Leverling销售代表

团队数据库

ID TeamName CoordinatorID EstimatorID ProjectManagerID MarketingSalesmanID

1 Red 7 2 8 6

2 Green 1 7 3 3

3 Blue 9 5 3 4

SELECT TOP (3) [Employee].[TeamTbl].[TeamName], [Employee].[TeamTbl].[CoordinatorID],
CONCAT( [Employee].[EmployeeTbl].[FirstName],' ', [Employee].[EmployeeTbl].[LastName],', ', [Employee].[EmployeeTbl].[Title]) As CoordinatorIDName
FROM [Employee].[TeamTbl]
INNER JOIN [Employee].[EmployeeTbl] ON [Employee].[TeamTbl].[CoordinatorID]=[Employee].[EmployeeTbl].[ID];

Sql Server Image if it helps make it clearer

Answer 1

您需要使用不同的别名多次加入Employee表：

SELECT TOP (3) 
    [Employee].[TeamTbl].[TeamName], 
    CONCAT( c.[FirstName],' ', c.[LastName],', ', c.[Title]) As CoordinatorName
    CONCAT( e.[FirstName],' ', e.[LastName],', ', e.[Title]) As EstimatorName
    CONCAT( p.[FirstName],' ', p.[LastName],', ', p.[Title]) As ProjectManagerName
    CONCAT( m.[FirstName],' ', m.[LastName],', ', m.[Title]) As MarketingSalesmanName
FROM 
    [Employee].[TeamTbl]
INNER JOIN 
    [Employee].[EmployeeTbl] c ON [Employee].[TeamTbl].[CoordinatorID]=c.[ID]
INNER JOIN 
    [Employee].[EmployeeTbl] e ON [Employee].[TeamTbl].[EstimatorID]=e.[ID]
INNER JOIN 
    [Employee].[EmployeeTbl] p ON [Employee].[TeamTbl].[ProjectManagerID]=p.[ID]
INNER JOIN 
    [Employee].[EmployeeTbl] m ON [Employee].[TeamTbl].[MarketingSalesmanID]=m.[ID]

多个列和联接，SQL Server Studio 2016

1 个答案: