Return records of last 6 months

Below is my SQL statement

DECLARE @dStart datetime ,
    @dEnd  datetime

SET @dStart = DATEADD(mm, -6, @dEnd)

Select * from MyTable
Where TheDate Between @dStart AND @dEnd

This will return all the records from today minus 6 months data.

But I want this months data plus only the previous 5 months data.

Currently it will return records from March as well.


Instead of

DATEADD(mm, -6, @dEnd)

You might use

dateadd(month, datediff(month, 0, @dEnd) - 5, 0)

This will truncate date to first of current month and substract five months from it.

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