SQL - Como consultar tabelas e foreign keys no PostgreSQL?

SELECT
   tc.table_name, tc.constraint_name, tc.table_name, kcu.column_name, 
   ccu.table_name AS foreign_table_name,
   ccu.column_name AS foreign_column_name 
FROM 
   information_schema.table_constraints AS tc 
   JOIN information_schema.key_column_usage AS kcu ON tc.constraint_name = kcu.constraint_name
   JOIN information_schema.constraint_column_usage AS ccu ON ccu.constraint_name = tc.constraint_name
WHERE constraint_type = 'FOREIGN KEY' 
ORDER BY tc.table_name
--AND tc.table_name='xxxx'