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SQL语句计算工作日

工作日:排除周日和法定节假日,根据自己业务需求进行调整,仅供参考

--考虑周日和节假日
        --HolidayList 节假日表,保存各个节假日的开始 StartDate  和结束日期 EndDate 


	DECLARE @startDate DATE = '' -- 起始日期  
	DECLARE @endDate DATE = '' -- 结束日期  

	DECLARE @totalDays INT = DATEDIFF(DAY, @startDate, @endDate) +1 -- 计算总天数  

	DECLARE @weekendDays INT = 0 -- 初始化周末天数  
	DECLARE @holidayDays INT = 0 -- 初始化节假日天数  
	DECLARE @currentDate DATE = @startDate -- 初始化当前日期为起始日期  
  
	WHILE @currentDate <= @endDate
	BEGIN  
		-- 检查当前日期是否在法定节假日范围内  
		DECLARE @holidayRange INT = (SELECT CASE WHEN StartDate <= @currentDate AND EndDate >= @currentDate THEN 1 ELSE 0 END FROM HolidayList WHERE StartDate <= @currentDate AND EndDate >= @currentDate)  
		IF @holidayRange = 1  
		BEGIN
			SET @holidayDays += 1  
		END
				
		-- 检查当前日期是否为周日   OR DATEPART(WEEKDAY, @currentDate) = 7  周六
		IF DATEPART(WEEKDAY, @currentDate) = 1 --周日 
		BEGIN
			SET @weekendDays += 1
		END
		SET @currentDate = DATEADD(DAY, 1, @currentDate) -- 递增当前日期  
	END  
	-- 计算实际工作天数 = 总天数 - 周末天数 - 节假日天数  
	DECLARE @workingDays INT = @totalDays - @weekendDays - @holidayDays  

	SELECT @totalDays AS TotalDays, @weekendDays AS WeekendDays, @holidayDays AS HolidayDays, @workingDays AS WorkingDays

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