创建了一个用户，但是没有权限操作public的权限

db_test=> create table public.tb_test(id number,name varchar(32));
ERROR: permission denied for schema public
DETAIL: N/A

报该错误，然后赋予grant all privileges to hxl;这个权限，但是这个权限很大，是否有办法创建一个只能操作某个库的账号呢

openGauss=# grant all privileges to hxl;
ALTER ROLE
openGauss=# \du
List of roles
Role name | Attributes | Member of
-----------+------------------------------------------------------------------------------------------------------------------+-----------
hxl | Sysadmin | {}
omm | Sysadmin, Create role, Create DB, Replication, Administer audit, Monitoradmin, Operatoradmin, Policyadmin, UseFT | {}