RENT OF</TT
> might fail if the cursor query
     does not meet the SQL standard's rules for being <SPAN
CLASS="QUOTE"
>"simply
     updatable"</SPAN
> (in particular, the cursor must reference just one table
     and not use grouping or <TT
CLASS="LITERAL"
>ORDER BY</TT
>).  Cursors
     that are not simply updatable might work, or might not, depending on plan
     choice details; so in the worst case, an application might work in testing
     and then fail in production.
    </P
><P
>     The main reason 