I am a beginer of Access. I have a database that consists of 4
columns/fields of dates. These dates/fields can be filled or can be blank.
I call them A, B, C, D.

Now I want to make a query or report to retrieve the date data in the
column/field of A. The criteria for this: all the dates in field A must be
later /larger than those in field B or C or D if B or C or D contains any
value.

I queried the A,B,C,D from the table that contains these fields. The first
criteria I wrote is "A is not Null". But then I want to say if B or C or D
is not blank, A must be any of B or C or D. But how do I write this
formula? I think to use expression builder. But still how?

Anyone can look into this for me? If you need more info, we can chat more.
I really need a rescue hand on this~~ Thanks!!!