Question

我对下表有此看法：

SELECT count(Incident.ID_Incident) 
    FROM Incident WHERE Incident.End_User = 7
        AND Incident.Date BETWEEN '2018-12-01 07:54:44' AND '2018-12-18 00:00:00';
GO

表格：

CREATE TABLE Incident(
ID_Incident INT         IDENTITY(1,1)   NOT NULL,
Date        DATETIME                    NULL,
End_User    INT                         NOT NULL,

以下是一些表值：

('2018-12-06 12:33:05', 003),
('2018-12-13 14:32:12', 010),
('2018-12-06 01:26:03', 015),
('2018-12-04 05:38:50', 012),
('2018-12-10 19:13:08', 011),
('2018-12-12 13:28:39', 005),
('2018-12-05 11:57:29', 006),
('2018-12-17 15:28:31', 007),
('2018-12-07 01:39:22', 007),
('2018-12-12 17:01:47', 009),
('2018-12-03 09:54:26', 010);

我需要将该视图转换为函数。我不知道为什么它不起作用。

任何建议都会很棒。

我写了这个：”

CREATE FUNCTION Total_case (@ID_End_User INT)
    RETURNS INT AS
        BEGIN
            DECLARE @ID_End_User_Search     INT

            SELECT @ID_End_User_Search = COUNT(ID_Incident)
                FROM Incident i
                    WHERE i.End_User = @ID_End_User_Search 
                        AND i.Date BETWEEN '2018-12-13 14:32:12' AND '2018-12-18 00:00:00'
                RETURN (@ID_End_User_Search)
            END

GO


DECLARE @SearchValue INT;

EXEC @SearchValue = [dbo].Total_case 
    @ID_End_User = 7;
SELECT @SearchValue AS 'Total case per user.'
GO

编辑：更改了标签并添加了表格

Answer 1

问题是您将在WHERE子句的函数中创建的变量用于过滤器。它已经为空，因此您收到0结果。将WHERE i.End_User = @ID_End_User_Search更改为WHERE i.End_User = @ID_End_User，您将看到结果。也是因为您在函数中使用了静态日期范围的示例？如果不是，这不是有效的函数，因此您每次需要更改日期范围时都需要修改函数。

这是更正的功能：

CREATE FUNCTION Total_case (@ID_End_User INT)
    RETURNS INT AS
        BEGIN
            DECLARE @ID_End_User_Search     INT

            SELECT @ID_End_User_Search = COUNT(ID_Incident)
                FROM Incident i
                    WHERE i.End_User = @ID_End_User
                        AND i.Date BETWEEN '2018-12-13 14:32:12' AND '2018-12-18 00:00:00'
                RETURN (@ID_End_User_Search)
            END

GO

这是创建函数的更好方法：

ALTER FUNCTION Total_case (@ID_End_User INT, @DateFrom DATETIME, @DateTo DATETIME)
    RETURNS INT AS
        BEGIN
            DECLARE @ID_End_User_Search     INT

            SELECT @ID_End_User_Search = COUNT(ID_Incident)
                FROM Incident i
                    WHERE i.End_User = @ID_End_User 
                        AND i.Date BETWEEN @DateFrom AND @DateTo
                RETURN (@ID_End_User_Search)
            END

GO

仅选择一个用户：

SELECT DBO.Total_case(7,'2018-12-01 14:32:12' ,'2018-12-19 00:00:00')

为所有用户选择：

SELECT *, DBO.Total_case(END_USER,'2018-12-01 14:32:12' ,'2018-12-19 00:00:00') TotalIncidents
FROM    (SELECT DISTINCT End_User 
        FROM Incident ) I

Answer 2

WHERE子句中有一个错误。

WHERE i.End_User = @ID_End_User_Search

应该是：

WHERE i.End_User = @ID_End_User

创建用户计数功能

2 个答案: