ALTER USER

where option can be:

    | CREATEDB | NOCREATEDB
    | CREATEUSER | NOCREATEUSER
    | CREATEEXTTABLE | NOCREATEEXTTABLE 
      [ ( <attribute>='<value>'[, ...] ) ]
           type='readable'|'writable'
           protocol='gpfdist'|'http'
    | LOGIN | NOLOGIN
    | CONNECTION LIMIT <connlimit>
    | VALID UNTIL '<timestamp>'
    | [ DENY <deny_point> ]
    | [ DENY BETWEEN <deny_point> AND <deny_point>]

The ALTER USER statement is a Greenplum Database extension. The SQL standard leaves the definition of users to the implementation.

Parent topic: SQL Command Reference