如何将参数传递给表值函数

Question

我想做点什么

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

Answer 1

您需要使用 CROSS APPLY 来实现此目标

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

Answer 2

以下适用于AdventureWorks数据库：

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)

修改

根据Kristof的专业知识，如果您尝试获取多个值，我已更新此示例：

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

Answer 3

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

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