Oops, missed some < and > that need to be < and > ...
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@ -1,5 +1,5 @@
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<!--
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$Header: /cvsroot/pgsql/doc/src/sgml/xindex.sgml,v 1.9 2000/03/28 02:53:02 tgl Exp $
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$Header: /cvsroot/pgsql/doc/src/sgml/xindex.sgml,v 1.10 2000/03/28 02:59:55 tgl Exp $
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Postgres documentation
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-->
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@ -107,7 +107,7 @@ SELECT oid FROM pg_am WHERE amname = 'btree';
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impose a strict ordering on keys, lesser to greater. Since
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<productname>Postgres</productname> allows the user to define operators,
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<productname>Postgres</productname> cannot look at the name of an operator
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(eg, ">" or "<") and tell what kind of comparison it is. In fact,
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(eg, ">" or "<") and tell what kind of comparison it is. In fact,
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some access methods don't impose any ordering at all. For example,
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<acronym>R-tree</acronym>s express a rectangle-containment relationship,
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whereas a hashed data structure expresses only bitwise similarity based
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@ -115,7 +115,7 @@ SELECT oid FROM pg_am WHERE amname = 'btree';
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needs some consistent way of taking a qualification in your query,
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looking at the operator and then deciding if a usable index exists. This
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implies that <productname>Postgres</productname> needs to know, for
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example, that the "<=" and ">" operators partition a
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example, that the "<=" and ">" operators partition a
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<acronym>B-tree</acronym>. <productname>Postgres</productname>
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uses strategies to express these relationships between
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operators and the way they can be used to scan indices.
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@ -203,7 +203,7 @@ SELECT oid FROM pg_am WHERE amname = 'btree';
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<note>
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<para>
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Strictly speaking, this routine can return a negative
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number (< 0), 0, or a non-zero positive number (> 0).
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number (< 0), 0, or a non-zero positive number (> 0).
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</para>
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</note>
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</para>
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@ -427,11 +427,11 @@ CREATE OPERATOR = (
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FROM pg_am am, pg_opclass opcl, complex_ops_tmp c
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WHERE amname = 'btree' AND
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opcname = 'complex_abs_ops' AND
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c.oprname = '<';
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c.oprname = '<';
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</programlisting>
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Now do this for the other operators substituting for the "1" in the
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third line above and the "<" in the last line. Note the order:
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third line above and the "<" in the last line. Note the order:
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"less than" is 1, "less than or equal" is 2, "equal" is 3, "greater
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than or equal" is 4, and "greater than" is 5.
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</para>
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