sql SQL：几个月的第一个/第二个星期二

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DECLARE @FirstTuesdayOfTwoMonthsBack datetime
DECLARE @SecondTuesdayOfTwoMonthsBack datetime
DECLARE @FirstTuesdayOfPreviousMonth datetime
DECLARE @SecondTuesdayOfPreviousMonth datetime
DECLARE @FirstTuesdayOfThisMonth datetime
DECLARE @SecondTuesdayOfThisMonth datetime
DECLARE @FirstTuesdayOfNextMonth datetime
SET @FirstTuesdayOfTwoMonthsBack = (SELECT DATEADD(Month, DATEDIFF(Month, 0, GETDATE()) - 2 , 0) + 6 - (DATEPART(Weekday, DATEADD(Month, DATEDIFF(Month, 0, GETDATE()) -2, 0)) + (@@DateFirst + 3) + 7) %7) --SECOND tuesday IN the previous month
SET @SecondTuesdayOfTwoMonthsBack = (SELECT DATEADD(Month, DATEDIFF(Month, 0, GETDATE()) - 2 , 0) + 6 + 7 - (DATEPART(Weekday, DATEADD(Month, DATEDIFF(Month, 0, GETDATE()) -2, 0)) + (@@DateFirst + 3) + 7) %7) --SECOND tuesday IN the previous month
SET @FirstTuesdayOfPreviousMonth = (SELECT DATEADD(Month, DATEDIFF(Month, 0, GETDATE()) - 1 , 0) + 6 - (DATEPART(Weekday, DATEADD(Month, DATEDIFF(Month, 0, GETDATE()) -1, 0)) + (@@DateFirst + 3) + 7) %7) --FIRST tuesday IN the previous month
SET @SecondTuesdayOfPreviousMonth = (SELECT DATEADD(Month, DATEDIFF(Month, 0, GETDATE()) - 1 , 0) + 6 + 7 - (DATEPART(Weekday, DATEADD(Month, DATEDIFF(Month, 0, GETDATE()) -1, 0)) + (@@DateFirst + 3) + 7) %7) --SECOND tuesday IN the previous month
SET @FirstTuesdayOfThisMonth = (SELECT DATEADD(Month, DATEDIFF(Month, 0, GETDATE()), 0 ) + 6 - (DATEPART(Weekday, DATEADD(Month, DATEDIFF(Month, 0, GETDATE()), 0)) + @@DateFirst + 3) %7) --FIRST tuesday IN this month
SET @SecondTuesdayOfThisMonth = (SELECT DATEADD(Month, DATEDIFF(Month, 0, GETDATE()), 0) + 6 + 7 - (DATEPART(Weekday, DATEADD(Month, DATEDIFF(Month, 0, GETDATE()), 0)) + (@@DateFirst + 3) + 7) %7) --SECOND tuesday IN the this month
SET @FirstTuesdayOfNextMonth = (SELECT DATEADD(Month, DATEDIFF(Month, 0, GETDATE()) + 1, 0) + 6 - (DATEPART(Weekday, DATEADD(Month, DATEDIFF(Month, 0, GETDATE()) + 1 , 0)) + @@DateFirst + 3) %7) --FIRST tuesday IN the next month

PRINT @FirstTuesdayOfTwoMonthsBack
PRINT @SecondTuesdayOfTwoMonthsBack
PRINT @FirstTuesdayOfPreviousMonth
PRINT @SecondTuesdayOfPreviousMonth
PRINT @FirstTuesdayOfThisMonth
PRINT @SecondTuesdayOfThisMonth
PRINT @FirstTuesdayOfNextMonth

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