对于来自不同表的XML路径。

Question

我有以下脚本可以为一个表生成XML。我需要稍微修改它，以便它从一个XML查询中的3个不同的表中提取它。我不知道如何修改它，以便它在1个查询中执行。我应该只创建一个存储过程。：

SELECT 
CAST(EmployeeNumber AS varchar(9)) AS [employee/id], 
LastName AS [name/last], 
FirstName AS [name/first], 
'Employee' AS [persontype], 
email AS email
FROM dbo.Employees AS sd
WHERE (IsActive = 'Y') FOR XML PATH('employees')      

另一张表是：

dbo.Contractors

对此的查询略有不同：

SELECT 
CAST(EmployeeNumber AS varchar(9)) AS [employee/id], 
LastName AS [name/last], 
FirstName AS [name/first], 
'Contractor' AS [persontype], 
email AS email
FROM dbo.Employees AS sd
WHERE (IsActive = 'Y') FOR XML PATH('employees')     

，最后一个是：

dbo.Interns

SELECT 
CAST(EmployeeNumber AS varchar(9)) AS [employee/id], 
LastName AS [name/last], 
FirstName AS [name/first], 
'Intern' AS [persontype], 
email AS email
FROM dbo.Employees AS sd
WHERE (IsActive = 'Y') FOR XML PATH('employees')     

只有更改的字段是第5行

Answer 1

希望这会有所帮助：

select * from (
 SELECT 
 CAST(EmployeeNumber AS varchar(9)) AS [employee/id], 
 LastName AS [name/last], 
 FirstName AS [name/first], 
 'Employee' AS [persontype], 
 email AS email
 FROM dbo.Employees AS sd
 WHERE (IsActive = 'Y') 
 union
 SELECT 
 CAST(EmployeeNumber AS varchar(9)) AS [employee/id], 
 LastName AS [name/last], 
 FirstName AS [name/first], 
 'Contractor' AS [persontype], 
 email AS email
 FROM dbo.Employees AS sd
 WHERE (IsActive = 'Y'
 union
 SELECT 
 CAST(EmployeeNumber AS varchar(9)) AS [employee/id], 
 LastName AS [name/last], 
 FirstName AS [name/first], 
 'Intern' AS [persontype], 
 email AS email
 FROM dbo.Employees AS sd
 WHERE (IsActive = 'Y')) employees
 FOR XML PATH('employees')  

Answer 2

为什么你不能UNION这三个查询？这会将3个单独的查询视为单个数据集。