CREATE GROUP name [ WITH [ SYSID gid ] [ USER username [, ...] ] ]
The name of the group.
The SYSID clause can be used to choose the Postgres group id of the new group. It is not necessary to do so, however.
If this is not specified, the highest assigned group id plus one, starting at 1, will be used as default.
A list of users to include in the group. The users must already exist.
CREATE GROUP will create a new group in the database installation. Refer to the adminstrator's guide for information about using groups for authentication. You must be a database superuser to use this command.
Create an empty group:
CREATE GROUP staff
Create a group with members:
CREATE GROUP marketing WITH USER jonathan, david