如何计算“星期二”的数量在TSQL中的两个日期之间？ [英] How to calculate the number of "Tuesdays" between two dates in TSQL?

问题描述

p星期二可以是任何值。

我想知道如何计算TSQL中两个日期之间的星期二数量？ p>

解决方案

  declare @from datetime ='9/20/2011'
 declare @ to datetime ='9/28/2011'
 
 select datediff（day，-6，@to）/ 7-datediff（day，-5，@from）/ 7 
  





1. 在@from之前的星期二星期一查找星期一。


2. 在@to


3. 之后的星期一查找星期




I'm trying to figure out how to calculate the number of "Tuesdays" between two dates in TSQL?

"Tuesday"could be any value.

解决方案

declare @from datetime= '9/20/2011' 
declare @to datetime  = '9/28/2011' 

select datediff(day, -6, @to)/7-datediff(day, -5, @from)/7

1. find the week of the first monday before the tuesday in @from.
2. find the week of the first monday after @to
3. subtract the weeks

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