sql-server - 如何将参数传递给表值函数

Question

我想做类似的事情

select * from tvfHello(@param) where @param in (Select ID from Users)

Answer 1

您需要使用CROSS APPLY来实现这一点

select 
    f.* 
from 
    users u
    cross apply dbo.tvfHello(u.ID) f

Answer 2

AdventureWorks 数据库中的以下工作：

CREATE FUNCTION dbo.EmployeeByID(@employeeID int)
RETURNS TABLE
AS RETURN
(
    SELECT * FROM HumanResources.Employee WHERE EmployeeID = @employeeID
)
GO


DECLARE @employeeId int

set @employeeId=10

select * from 
EmployeeById(@employeeId) 
WHERE @EmployeeId in (SELECT EmployeeId FROM HumanResources.Employee)

编辑

根据 Kristof 的专业知识，如果您尝试获取多个值，我已经更新了此示例，例如：

select * 
from HumanResources.Employee e
CROSS APPLY  EmployeeById(e.EmployeeId)
WHERE e.EmployeeId in (5,6,7,8)

Answer 3

这对我来说看起来不错，除了你应该总是在你的函数前面加上它们的模式（通常是 dbo）。所以查询应该是：

SELECT * FROM dbo.tvfHello(@param) WHERE @param IN (SELECT ID FROM Users)