本文介绍了SQL 返回两个传入日期之间的工作日数的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着跟版网的小编来一起学习吧！
问题描述
我需要编写一个 sql 查询，返回两个给定日期之间的工作日(周一至周五)数.
I need to write an sql query that returns the number of Working days (Monday - Friday) between two given dates.
我想知道最有效的方法是什么?
I was wondering what would be the most efficient way to do this?
SELECT --Start with total number of days including weekends
(DATEDIFF(dd,@StartDate,@EndDate)+1) --Subtact 2 days for each full weekend
(DATEDIFF(wk,@StartDate,@EndDate)*2) --If StartDate is a Sunday, Subtract 1
ELSE 0 END) --If EndDate is a Saturday, Subtract 1
FROM dual
然后，能够从该计数中删除假期(例如圣诞节和节礼日)也会很有帮助.
Then it would also be helpful to be able to remove holidays from this count such as christmas day and boxing day.
有什么想法吗?
推荐答案
计算两个日期之间的工作日数的简单方法是:
an easy way to calculate to number of weekdays between 2 dates is :
SELECT
date1,
date2,
((date2-date1)-2*FLOOR((date2-date1)/7)-DECODE(SIGN(TO_CHAR(date2,'D')-
TO_CHAR(date1,'D')),-1,2,0)+DECODE(TO_CHAR(date1,'D'),7,1,0)-
DECODE(TO_CHAR(date2,'D'),7,1,0))*24 as WorkDays
FROM
tablename
ORDER BY date1,date2
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