IDT-如何从当前月份获取上个月（12月）

Question

This is what I have so far. I am trying to have filter that will always display Last Full Month. Below query works for all months except for January.

DateDim_End_Date.YEAR=year(getDate())
and DateDim_End_Date.MONTHNUMBER = month(getDate())-1

I was trying something like

CASE WHEN (DateDim_End_Date.MONTHNUMBER = month(getDate())) = 1 THEN 
(DateDim_End_Date.YEAR=year(getDate())-1
and DateDim_End_Date.MONTHNUMBER = month(getDate())-1)
WHEN DateDim_End_Date.MONTHNUMBER = month(getDate())) != 1 THEN 
(DateDim_End_Date.YEAR=year(getDate())
and DateDim_End_Date.MONTHNUMBER = month(getDate())-1)
END

It does not have to be CASE statement to solve this, it was just my initial approach Thanks in advance.

Answer 1

You can do something like:

DateDim_End_Date.YEAR=year(getDate())
and DateDim_End_Date.MONTHNUMBER = month(DATEADD(MONTH, -1, getDate()))

That will solve the issue with January, since you are now first subtracting a month from a date before determining what the new month is.

It is much easier to store dates in a single date/datetime column though.