Question

With SQL Server, I have a column with a launch date (dateTime). I want to report on everything that is being launched between all of last month (from viewing date) thru all of this month and next month.

So basically a full 3 month period.

What is the best way to write that?

Answer 1

Are you looking for something like this?

DECLARE
    @StartDate DATETIME,
    @EndDate DATETIME

SELECT
    @StartDate = DATEADD(MM, DATEDIFF(MM, 0, GETDATE()) - 1, 0),
    @EndDate = DATEADD(MM, DATEDIFF(MM, 0, GETDATE()) + 2, 0)

-- DATEADD(MM, DATEDIFF(MM, 0, GETDATE()), 0), -- beginning of this month
-- DATEADD(MM, DATEDIFF(MM, 0, GETDATE()) - 1, 0), -- beginning of last month
-- DATEADD(MM, DATEDIFF(MM, 0, GETDATE()) + 1, 0) -- beginning of next month
-- DATEADD(MM, DATEDIFF(MM, 0, GETDATE()) + 2, 0) -- beginning of two months from now

SELECT
    *
FROM
    [Table]
WHERE
    [LaunchDate] >= @StartDate
AND [LaunchDate] < @EndDate

This will give you all the results starting from the beginning of the previous month and before the beginning of two months from now (a full 3 month range)