 to the range-table entry where the result should
    go.  Everything else is absolutely the same.  So having two tables
    <TT
CLASS="LITERAL"
>t1</TT
> and <TT
CLASS="LITERAL"
>t2</TT
> with columns <TT
CLASS="LITERAL"
>a</TT
> and
    <TT
CLASS="LITERAL"
>b</TT
>, the query trees for the two statements:

</P><PRE
CLASS="PROGRAMLISTING"
>SELECT t2.b FROM t1, t2 WHERE t1.a = t2.a;

UPDATE t1 SET b = t2.b FROM t2 WHERE t1.a = t2.a;</PRE
><P>

    are nearly identical.  In particular:

    <P
></P
></P><UL
