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Update type-coercion discussions to reflect current reality.
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doc/src/sgml/func.sgml

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<!-- $Header: /cvsroot/pgsql/doc/src/sgml/func.sgml,v 1.43 2000/12/16 19:33:23 tgl Exp $ -->
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<!-- $Header: /cvsroot/pgsql/doc/src/sgml/func.sgml,v 1.44 2000/12/17 05:55:26 tgl Exp $ -->
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<chapter id="functions">
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<title>Functions and Operators</title>
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<para>
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There are two separate approaches to pattern matching provided by
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<productname>Postgres</productname>: The <acronym>SQL</acronym>
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<productname>Postgres</productname>: the <acronym>SQL</acronym>
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<function>LIKE</function> operator and
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<acronym>POSIX</acronym>-style regular expressions.
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</para>
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</informalexample>
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<para>
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The data types of all possible <replaceable>result</replaceable>
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expressions must match.
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The data types of all the <replaceable>result</replaceable>
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expressions must be coercible to a single output type.
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See <xref linkend="typeconv-union-case"> for more detail.
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</para>
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<synopsis>

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