Dear Listers,

May be a rather simple problem, but I am going around for days...

I have a table in MI 4.5. The first columns has categories (A,B,C,D) the =
next columns have coordinates X,Y (Lat, Long). At the same coordinates, =
may be different categories (in separate records). I wish to select a =
given category. Easy. I wish to select everything but a given category. =
Not so easy, because records without the category may fall into a =
coordinate where the category I wish to exclude has been already found =
(and listed in a different record).

Some help?

Thanks and best wishes,


Prof. A. Estrada-Pena
Dept. of Parasitology
Vet. Faculty
University of Zaragoza (Spain)

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