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there are occasions when one may want to calculate months with more than 28 days in SQL Server. The challenge that may arise is that a generic T-SQL function does not exist for this computation. Nonetheless, the ability to perform such computation is made possible through the proper use of date functions in T-SQL, combined with the ability to leverage cursors or a looping construct within a stored procedure.
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In this post, we shall be focusing on how to count the number of months in SQL Server with a duration of more than 28 days. We shall start by creating a cursor to loop through each year and month, and then use a combination of several date functions to achieve the desired outcome.
首先，我們創(chuàng)建一個游標(biāo)來循環(huán)每一年和每一個月：
— Declare Cursor declare c1 cursor for select distinct year(date) as [year], month(date) as [month] from tablename order by [year], [month]
接下來，我們使用dateadd函數(shù)來計(jì)算每個月的總天數(shù)：
declare @days int, @month date set @month = dateadd(mm, 1, datefromparts(@year, @month, 1)) set @days = datediff(dd, datefromparts(@year, @month, 1), @month)
隨后，我們通過比較總天數(shù)是否大于28來判斷每個月是否包含天數(shù)大于28天：
if @days > 28 begin — Increment the count set @longmonthcount = @longmonthcount + 1 end
最后，我們返回結(jié)果：
— Return result select @longmonthcount count
因此，以上代碼是如何用游標(biāo)和dateadd函數(shù)統(tǒng)計(jì)超過28天的月份。這種方法可以確保實(shí)現(xiàn)這種統(tǒng)計(jì)。
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網(wǎng)站題目：大于等于28SQLServer中超過28天的月份統(tǒng)計(jì)（sqlserver月幾天）
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