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doc: improve bpchar and character type length details
Reported-by: Jeff Davis Discussion: https://postgr.es/m/32a9b8357e8e29b04f395f92c53b64e015a4caf1.camel@j-davis.com Author: Jeff Davis, adjustments by me Backpatch-through: 16
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@ -1174,7 +1174,11 @@ SELECT '52093.89'::money::numeric::float8;
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</row>
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<row>
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<entry><type>character(<replaceable>n</replaceable>)</type>, <type>char(<replaceable>n</replaceable>)</type>, <type>bpchar(<replaceable>n</replaceable>)</type></entry>
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<entry>fixed-length, blank padded</entry>
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<entry>fixed-length, blank-padded</entry>
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</row>
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<row>
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<entry><type>bpchar</type></entry>
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<entry>variable unlimited length, blank-trimmed</entry>
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</row>
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<row>
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<entry><type>text</type></entry>
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@ -1230,19 +1234,22 @@ SELECT '52093.89'::money::numeric::float8;
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<para>
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The type name <type>varchar</type> is an alias for <type>character
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varying</type>, while <type>char</type> and <type>bpchar</type> are
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aliases for <type>character</type>.
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The <type>varchar</type> and <type>char</type> aliases are defined in
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the <acronym>SQL</acronym> standard, but <type>bpchar</type> is
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a <productname>PostgreSQL</productname> extension.
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varying</type>, while <type>bpchar</type> (with length specifier) and
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<type>char</type> are aliases for <type>character</type>. The
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<type>varchar</type> and <type>char</type> aliases are defined in the
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<acronym>SQL</acronym> standard; <type>bpchar</type> is a
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<productname>PostgreSQL</productname> extension.
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</para>
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<para>
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If specified, the length <replaceable>n</replaceable> must be greater
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than zero and cannot exceed 10485760.
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<type>character</type> without length specifier is equivalent to
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<type>character(1)</type>. If <type>character varying</type> is used
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without length specifier, the type accepts strings of any size.
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than zero and cannot exceed 10,485,760. If <type>character
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varying</type> (or <type>varchar</type>) is used without
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length specifier, the type accepts strings of any length. If
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<type>bpchar</type> lacks a length specifier, it also accepts strings
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of any length, but trailing spaces are semantically insignificant.
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If <type>character</type> (or <type>char</type>) lacks a specifier,
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it is equivalent to <type>character(1)</type>.
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</para>
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<para>
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