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   In order to obtain the correct functioning of the entire application
   database, it is fundamental to define the relations between the different
   files in the the correct way. A relation connects logical information
   coming from different files, avoiding data redundance.

   Within the dBsee environment it is possible to define three types of
   relations:

     . 1:N Relation

     . N:1 Relation or lookup

     . 1:1 Relation

   For 1:N and 1:1 relations, the referential integrity of the data is
   guaranteed when both deleting and modifying the main key on the relational
   parent file.