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Back out EXCEPT/DIFFERENCE patch. Seems I forgot the details of this.
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@ -1,5 +1,5 @@
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<!--
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<!--
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$Header: /cvsroot/pgsql/doc/src/sgml/sql.sgml,v 1.25 2002/03/15 15:55:58 momjian Exp $
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$Header: /cvsroot/pgsql/doc/src/sgml/sql.sgml,v 1.26 2002/03/15 16:16:31 momjian Exp $
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-->
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-->
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<chapter id="sql">
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<chapter id="sql">
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@ -488,7 +488,7 @@ attributes are taken from. We often write a relation scheme as
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<listitem>
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<listitem>
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<para>
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<para>
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EXCEPT (− or ∖): builds the set difference of
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DIFFERENCE (− or ∖): builds the set difference of
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two tables. Let <classname>R</classname> and <classname>S</classname>
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two tables. Let <classname>R</classname> and <classname>S</classname>
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again be two tables with the same
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again be two tables with the same
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arity. <classname>R</classname> - <classname>S</classname>
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arity. <classname>R</classname> - <classname>S</classname>
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