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<chapter id="sql">
<listitem>
<para>
- EXCEPT (− or ∖): builds the set difference of
+ DIFFERENCE (− or ∖): builds the set difference of
two tables. Let <classname>R</classname> and <classname>S</classname>
again be two tables with the same
arity. <classname>R</classname> - <classname>S</classname>