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Document that chr(0) is not supported, and why.
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<!-- $PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.420 2008/02/26 15:32:30 petere Exp $ -->
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<!-- $PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.421 2008/03/03 17:11:13 momjian Exp $ -->
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<chapter id="functions">
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<chapter id="functions">
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<title>Functions and Operators</title>
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<title>Functions and Operators</title>
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Character with the given code. For <acronym>UTF8</acronym> the
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Character with the given code. For <acronym>UTF8</acronym> the
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argument is treated as a Unicode code point. For other multibyte
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argument is treated as a Unicode code point. For other multibyte
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encodings the argument must designate a strictly
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encodings the argument must designate a strictly
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<acronym>ASCII</acronym> character.
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<acronym>ASCII</acronym> character. The NULL (0) character is not
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allowed because text data types cannot reliably store such bytes.
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</entry>
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</entry>
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<entry><literal>chr(65)</literal></entry>
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<entry><literal>chr(65)</literal></entry>
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<entry><literal>A</literal></entry>
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<entry><literal>A</literal></entry>
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