Defines a new database role with the LOGIN privilege by default.
CREATE USER name [ [WITH] option [ ... ] ]
where option can be:
SUPERUSER | NOSUPERUSER | CREATEDB | NOCREATEDB | CREATEROLE | NOCREATEROLE | CREATEUSER | NOCREATEUSER | INHERIT | NOINHERIT | LOGIN | NOLOGIN | [ ENCRYPTED | UNENCRYPTED ] PASSWORD 'password' | VALID UNTIL 'timestamp' | IN ROLE rolename [, ...] | IN GROUP rolename [, ...] | ROLE rolename [, ...] | ADMIN rolename [, ...] | USER rolename [, ...] | SYSID uid | RESOURCE QUEUE queue_name
As of Greenplum Database release 2.2, CREATE USER has been replaced by CREATE ROLE, although it is still accepted for backwards compatibility.
The only difference between CREATE ROLE and CREATE USER is that LOGIN is assumed by default with CREATE USER, whereas NOLOGIN is assumed by default with CREATE ROLE.
There is no CREATE USER statement in the SQL standard.