将Datediff设置为存储过程中的变量

Question

我试图在假期表中插入一个新的假期，但是我有一个工期列，我想在存储过程中进行计算。我已经使用日期差异来计算日期，但是我想将日期差异声明为变量，然后将变量打印到insert语句的值中。使用下面的语句，我不断收到此错误：在INSERT的SET子句或列列表中多次指定了列名“ StartDate”。一列不能在同一子句中分配多个值。修改该子句以确保一列仅更新一次。如果此语句更新视图或在视图中插入列，则列别名会隐藏代码中的重复项。

CREATE PROCEDURE    spRequestHoliday    @EmployeeID int,
                                    @StartDate date,
                                    @EndDate date,
                                    @Duration int

                /*
                Name: spRequestHoliday
                Description: Inserts a requested holiday into the holidays table
                */

如

SELECT DATEDIFF(Day,@StartDate,@EndDate) AS DiffDate

BEGIN
    INSERT INTO Holidays(EmployeeID, StartDate, EndDate, Duration,StartDate)
    VALUES(@EmployeeID, @StartDate, @EndDate, 'DiffDate','PE')
END

Answer 1

尝试这个

DECLARE @DateDiff AS Int

SELECT @DateDiff = DATEDIFF(Day,@StartDate,@EndDate)

INSERT INTO Holidays(EmployeeID, StartDate, EndDate, Duration, PE) --< columns name for PE
VALUES(@EmployeeID, @StartDate, @EndDate, @DateDiff,'PE')

要么

INSERT INTO Holidays(EmployeeID, StartDate, EndDate, Duration, PE) --< columns name for PE
VALUES(@EmployeeID, @StartDate, @EndDate, DATEDIFF(Day,@StartDate,@EndDate),'PE')