Query to know the Primary keys of all tables in a Schema in Oracle Database

How query all primary keys of all tables owned by a schema_name - Just replace 'P' with 'F' to know foreign key

select
   all_cons_columns.owner as schema_name,
   all_cons_columns.table_name,  
   all_cons_columns.column_name, 
   all_cons_columns.position, 
   all_constraints.status,
   all_constraints.constraint_name
from all_constraints, all_cons_columns 
where 
   all_constraints.constraint_type = 'F'
   and all_constraints.constraint_name = all_cons_columns.constraint_name
   and all_constraints.owner = all_cons_columns.owner
   and all_cons_columns.owner = '&User_name'
  order by 
   all_cons_columns.owner,
   all_cons_columns.table_name, 
   all_cons_columns.position;