Null in where statement (RDB import)

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1

I would like to filter an RDB table during import by using the where statement and check for null value of a field (pseudo code!):

'name': table = "name"
   fields 
      …
   where (
      .'field A' > // some value
      and .'field B' == // null
)

How to use the value for null here?

2

You should be able to write your null filter like this:

.'field B' is null