.sql</TT
> contains the commands to modify
     version <TT
CLASS="LITERAL"
>1.0</TT
> of extension <TT
CLASS="LITERAL"
>foo</TT
> into version
     <TT
CLASS="LITERAL"
>1.1</TT
>).
    </P
><P
>     Given that a suitable update script is available, the command
     <TT
CLASS="COMMAND"
>ALTER EXTENSION UPDATE</TT
> will update an installed extension
     to the specified new version.  The update script is run in the same
     environment that <TT
CLASS="COMMAND"
>CREATE EXTENSION</TT
> provides for installa