[Logic] Marking QSLs to print?

[AE0Q V31RY]

 I would like to be able to mark newly imported contest contacts for QSL
label printing, but do not know the dBase commands to use to sort them the
way I want.  Can anyone help?

 The criteria are to print a label for any new contact that has NOT had one
printed for the same band AND mode for a previous QSO.
  So, I would like to compare all new contacts (usually from a 2-day period
of a contest) to all others in the database, and if a previous entry with
the same station has QSL_SENT=3DF and BAND and MODE are the same, the new
contact would be marked QSL_SENT=3DX.  If the BAND and MODE are not the same
as any previous ones, set QSL_SENT=3DR.

  I do use the Database Command screen for other massaging of the database,
but the syntax and commands to do the above requirements has escaped me so
far.

   It is a real pain with 30k contacts in the log to compare all the
entries in the popular countries to see if I want to print a label after a
contest.

  Help!! 73 - Glenn=20
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     AE=D8Q / V31RY
  v31ry@ix.netcom.com
   www.qsl.net/ae0q/