  A role is
   an entity that can own database objects and have database privileges;
   a role can be considered a <SPAN
CLASS="QUOTE"
>"user"</SPAN
>, a <SPAN
CLASS="QUOTE"
>"group"</SPAN
>, or both
   depending on how it is used.  Refer to
   <A
HREF="user-manag.html"
>Chapter 20</A
> and <A
HREF="client-authentication.html"
>Chapter 19</A
> for information about managing
   users and authentication.  You must have <TT
CLASS="LITERAL"
>CREATEROLE</TT
>
   privilege or be a database superuser to use this c