Instead of
DROP TABLE IF EXISTS users CASCADE; DROP TABLE IF EXISTS gifts CASCADE; DROP TABLE IF EXISTS relationship CASCADE; DROP TABLE IF EXISTS reservation CASCADE;
You can simply write
DROP TABLE IF EXISTS users, gifts, relationship, reservation CASCADE;
Instead of
DROP TABLE IF EXISTS users CASCADE; DROP TABLE IF EXISTS gifts CASCADE; DROP TABLE IF EXISTS relationship CASCADE; DROP TABLE IF EXISTS reservation CASCADE;
You can simply write
DROP TABLE IF EXISTS users, gifts, relationship, reservation CASCADE;