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Back out EXCEPT/DIFFERENCE patch. Seems I forgot the details of this.

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Original file line number	Diff line number	Diff line change
`@@ -1,5 +1,5 @@`
`1`	`1`	`<!--`
`2`		`-$Header: /cvsroot/pgsql/doc/src/sgml/sql.sgml,v 1.25 2002/03/1515:55:58 momjian Exp $`
	`2`	`+$Header: /cvsroot/pgsql/doc/src/sgml/sql.sgml,v 1.26 2002/03/1516:16:31 momjian Exp $`
`3`	`3`	`-->`
`4`	`4`
`5`	`5`	`<chapter id="sql">`
`@@ -488,7 +488,7 @@ attributes are taken from. We often write a relation scheme as`
`488`	`488`
`489`	`489`	`<listitem>`
`490`	`490`	`<para>`
`491`		`-EXCEPT (− or &setmn;): builds the set difference of`
	`491`	`+DIFFERENCE (− or &setmn;): builds the set difference of`
`492`	`492`	`two tables. Let <classname>R</classname> and <classname>S</classname>`
`493`	`493`	`again be two tables with the same`
`494`	`494`	`arity. <classname>R</classname> - <classname>S</classname>`

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