How to discover the underlying primary (or unique) key columns from an Oracle view

Question

I was wondering whether there is a possibility for me to discover the underlying primary (or unique) key columns for all tables involved in an Oracle view. Here\'s an exampl

Answer 1

SELECT column_name FROM user_ind_columns
  WHERE index_name =
   (SELECT index_name FROM user_constraints
      WHERE constraint_type='P' AND table_name='T_A')
ORDER BY column_position;

If you want to do it for all tables that a view depends on, then change the condition on table_name to something like:

table_name IN (SELECT referenced_name FROM user_dependencies
                 WHERE name='view_name' AND referenced_type='TABLE')