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我正在嘗試創建一個UDF，根據時間做兩件不同的事情。以下是我的代碼。我想知道是否可以在UDF中使用IF語句，因爲我正在設置4個錯誤，在Begin和Return附近的語法不正確，並且返回值的返回值也無法在此上下文中使用....任何建議？SQL你可以在UDF中使用IF語句嗎？你如何做到這一點？
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE FUNCTION [dbo].[udf_TEST]
(
@StartDate DATETIME,
@EndDate DATETIME
)
--DECLARE @StartDate DATETIME
--DECLARE @EndDate DATETIME
--SET @StartDate = '2010-07-06 14:46:37.577'
--SET @EndDate = '2010-07-09 09:04:31.290'
BEGIN
RETURNS VARCHAR(MAX)
(
IF (CONVERT(VARCHAR(13), @StartDate, 114) > CONVERT(VARCHAR(13), @EndDate, 114))
BEGIN
DECLARE @NonWorkTime1 INT
SET @NonWorkTime1 = 780
--How many minutes are between order start and end time including non working time
DECLARE @AllMins1 INT
--Declares how many minutes are in a day and makes it float to get remainder minutes when divided
DECLARE @MinsInDay1 DECIMAL
SET @MinsInDay1 = 1440.0
--Finds how many minutes are between start and end time excluding weekends and assignes to variable
SET @AllMins1 = ((DATEDIFF(mi, @StartDate, @EndDate))
-(((DATEDIFF(wk, @StartDate, @EndDate) * 2) * 24) * 60)
-(((CASE WHEN DATENAME(dw, @StartDate) = 'Sunday' THEN 1 ELSE 0 END) * 24) * 60)
-(((CASE WHEN DATENAME(dw, @EndDate) = 'Saturday' THEN 1 ELSE 0 END) * 24) * 60))
--Calculates how many days have elapsed in the minutes that the order has taken
DECLARE @MinDays1 INT
SET @MinDays1 = (@AllMins1/@MinsInDay1)
--Subtracts complete day non worked minutes from final minutes between orders
DECLARE @FinalMinutes1 AS DECIMAL
SET @FinalMinutes1 = (@AllMins1 - (@MinDays1 * @NonWorkTime1) - 360 - 420)
RETURN @FinalMinutes1
END
ELSE
BEGIN
--RETURNS VARCHAR(MAX)
--How many minutes a day are not worked for trips
DECLARE @NonWorkTime INT
SET @NonWorkTime = 780
--How many minutes are between order start and end time including non working time
DECLARE @AllMins INT
--Declares how many minutes are in a day and makes it float to get remainder minutes when divided
DECLARE @MinsInDay DECIMAL
SET @MinsInDay = 1440.0
--Finds how many minutes are between start and end time excluding weekends and assignes to variable
SET @AllMins = ((DATEDIFF(mi, @StartDate, @EndDate))
-(((DATEDIFF(wk, @StartDate, @EndDate) * 2) * 24) * 60)
-(((CASE WHEN DATENAME(dw, @StartDate) = 'Sunday' THEN 1 ELSE 0 END) * 24) * 60)
-(((CASE WHEN DATENAME(dw, @EndDate) = 'Saturday' THEN 1 ELSE 0 END) * 24) * 60))
--Calculates how many days have elapsed in the minutes that the order has taken
DECLARE @MinDays INT
SET @MinDays = (@AllMins/@MinsInDay)
--Subtracts complete day non worked minutes from final minutes between orders
DECLARE @FinalMinutes AS DECIMAL
SET @FinalMinutes = (@AllMins - (@MinDays * @NonWorkTime))
RETURN @FinalMinutes
END
)
END