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CREATE GROUP group_name [ [ WITH ] option [ ... ] ] 
    [ ENCRYPTED | UNENCRYPTED ] { PASSWORD | IDENTIFIED BY } { 'password' [ EXPIRED ] | DISABLE };

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where option can be:
{SYSADMIN | NOSYSADMIN}
    | {MONADMIN | NOMONADMIN}
    | {OPRADMIN | NOOPRADMIN}
    | {POLADMIN | NOPOLADMIN}
    | {AUDITADMIN | NOAUDITADMIN}
    | {CREATEDB | NOCREATEDB}
    | {USEFT | NOUSEFT}
    | {CREATEROLE | NOCREATEROLE}
    | {INHERIT | NOINHERIT}
    | {LOGIN | NOLOGIN}
    | {REPLICATION | NOREPLICATION}
    | {INDEPENDENT | NOINDEPENDENT}
    | {VCADMIN | NOVCADMIN}
    | {PERSISTENCE | NOPERSISTENCE}
    | CONNECTION LIMIT connlimit
    | VALID BEGIN 'timestamp'
    | VALID UNTIL 'timestamp'
    | RESOURCE POOL 'respool'
    | USER GROUP 'groupuser'
    | PERM SPACE 'spacelimit'
    | NODE GROUP logic_group_name
    | IN ROLE role_name [, ...]
    | IN GROUP role_name [, ...]
    | ROLE role_name [, ...]
    | ADMIN role_name [, ...]
    | USER role_name [, ...]
    | SYSID uid
    | DEFAULT TABLESPACE tablespace_name
    | PROFILE DEFAULT
    | PROFILE profile_name
    | PGUSER

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--创建组my_group。
gaussdb=# CREATE GROUP my_group PASSWORD '*********';

--删除组。
gaussdb=# DROP GROUP my_group;