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Get the First and Last Day of all the Months based on @ReportDate


Get the First and Last Day of all the Months based on @ReportDate

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sql1411
sql1411
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Is there a way to get the First and Last Day of all the months (including current) based on the @ReportDate for current year and previous year?
Luis Cazares
Luis Cazares
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Could you give sample data and expected results?


Luis C.
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Jeff Moden
Jeff Moden
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sql1411 (10/17/2013)
Is there a way to get the First and Last Day of all the months (including current) based on the @ReportDate for current year and previous year?


Yes.
--===== Create and populate the @ReportDate parameter
-- which could be used as an input to a function
-- or stored procedure.
DECLARE @pReportDate DATETIME;
SELECT @pReportDate = GETDATE();

--===== Produce 2 years of monthly start and end dates
-- to include the current year of @pReportDate
WITH
B1(N) AS (SELECT 1 UNION ALL SELECT 1),
B5(N) AS (SELECT 1 FROM B1 a, B1 b, B1 c, B1 d, B1 e),
cteTally(N) AS (SELECT TOP 24 ROW_NUMBER() OVER (ORDER BY B5.N) FROM B5)
SELECT MonthStart = DATEADD(mm,t.N-1,ca.StartDate)
,MonthEnd = DATEADD(mm,t.N ,ca.StartDate)-1
FROM cteTally t
CROSS APPLY (SELECT DATEADD(yy,DATEDIFF(yy,0,@pReportDate)-1,0)) ca (StartDate)
;




However, to make aggregations easier to include any times in the datetimes of the data for reporting, I'd make the code return the first of the month and the first of the following month.

--===== Create and populate the @ReportDate parameter
-- which could be used as an input to a function
-- or stored procedure.
DECLARE @pReportDate DATETIME;
SELECT @pReportDate = GETDATE();

--===== Produce 2 years of monthly start and next month start dates
-- to include the current year of @pReportDate
WITH
B1(N) AS (SELECT 1 UNION ALL SELECT 1),
B5(N) AS (SELECT 1 FROM B1 a, B1 b, B1 c, B1 d, B1 e),
cteTally(N) AS (SELECT TOP 24 ROW_NUMBER() OVER (ORDER BY B5.N) FROM B5)
SELECT MonthStart = DATEADD(mm,t.N-1,ca.StartDate)
,NextMonthStart = DATEADD(mm,t.N ,ca.StartDate)
FROM cteTally t
CROSS APPLY (SELECT DATEADD(yy,DATEDIFF(yy,0,@pReportDate)-1,0)) ca (StartDate)
;




--Jeff Moden

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First step towards the paradigm shift of writing Set Based code:
     Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column.
Although they tell us that they want it real bad, our primary goal is to ensure that we dont actually give it to them that way.
Although change is inevitable, change for the better is usually not.
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sql1411
sql1411
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Thank you both for your time to answer my post. Really appreciate it.
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