how can i select columns of two dataframe

I have a problem and I wanted help, as I can join several tables and make a table with a condition,
that is the tables a, b, c. from tables b and c select the columns that are in b but that are not repeated in c, and with table a show all columns except those shown in the union of tables b and c

We don't really have enough info to help you out. Could you ask this with a minimal REPRoducible EXample (reprex)? A reprex makes it much easier for others to understand your issue and figure out how to help.

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