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Commit 0eed62f3 authored by Bruce Momjian's avatar Bruce Momjian
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Reorder VARCHAR() to appear before CHAR() in docs.

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doc/src/sgml/datatype.sgml
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<!--
$Header: /cvsroot/pgsql/doc/src/sgml/datatype.sgml,v 1.110 2002/12/06 05:17:42 momjian Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/datatype.sgml,v 1.111 2003/01/15 18:01:04 momjian Exp $
-->
<chapter id="datatype">
......@@ -86,18 +86,18 @@ $Header: /cvsroot/pgsql/doc/src/sgml/datatype.sgml,v 1.110 2002/12/06 05:17:42 m
<entry>binary data</entry>
</row>
<row>
<entry><type>character(<replaceable>n</replaceable>)</type></entry>
<entry><type>char(<replaceable>n</replaceable>)</type></entry>
<entry>fixed-length character string</entry>
</row>
<row>
<entry><type>character varying(<replaceable>n</replaceable>)</type></entry>
<entry><type>varchar(<replaceable>n</replaceable>)</type></entry>
<entry>variable-length character string</entry>
</row>
<row>
<entry><type>character(<replaceable>n</replaceable>)</type></entry>
<entry><type>char(<replaceable>n</replaceable>)</type></entry>
<entry>fixed-length character string</entry>
</row>
<row>
<entry><type>cidr</type></entry>
<entry></entry>
......@@ -248,7 +248,7 @@ $Header: /cvsroot/pgsql/doc/src/sgml/datatype.sgml,v 1.110 2002/12/06 05:17:42 m
The following types (or spellings thereof) are specified by
<acronym>SQL</acronym>: <type>bit</type>, <type>bit
varying</type>, <type>boolean</type>, <type>char</type>,
<type>character</type>, <type>character varying</type>,
<type>character varying</type>, <type>character</type>,
<type>varchar</type>, <type>date</type>, <type>double
precision</type>, <type>integer</type>, <type>interval</type>,
<type>numeric</type>, <type>decimal</type>, <type>real</type>,
......@@ -811,14 +811,14 @@ CREATE TABLE <replaceable class="parameter">tablename</replaceable> (
</row>
</thead>
<tbody>
<row>
<entry><type>character(<replaceable>n</>)</type>, <type>char(<replaceable>n</>)</type></entry>
<entry>fixed-length, blank padded</entry>
</row>
<row>
<entry><type>character varying(<replaceable>n</>)</type>, <type>varchar(<replaceable>n</>)</type></entry>
<entry>variable-length with limit</entry>
</row>
<row>
<entry><type>character(<replaceable>n</>)</type>, <type>char(<replaceable>n</>)</type></entry>
<entry>fixed-length, blank padded</entry>
</row>
<row>
<entry><type>text</type></entry>
<entry>variable unlimited length</entry>
......@@ -835,29 +835,29 @@ CREATE TABLE <replaceable class="parameter">tablename</replaceable> (
<para>
<acronym>SQL</acronym> defines two primary character types:
<type>character(<replaceable>n</>)</type> and <type>character
varying(<replaceable>n</>)</type>, where <replaceable>n</> is a
positive integer. Both of these types can store strings up to
<type>character varying(<replaceable>n</>)</type> and
<type>character(<replaceable>n</>)</type>, where <replaceable>n</>
is a positive integer. Both of these types can store strings up to
<replaceable>n</> characters in length. An attempt to store a
longer string into a column of these types will result in an
error, unless the excess characters are all spaces, in which case
the string will be truncated to the maximum length. (This
somewhat bizarre exception is required by the
<acronym>SQL</acronym> standard.) If the string to be stored is
shorter than the declared length, values of type
<type>character</type> will be space-padded; values of type
<type>character varying</type> will simply store the shorter
the string will be truncated to the maximum length. (This somewhat
bizarre exception is required by the <acronym>SQL</acronym>
standard.) If the string to be stored is shorter than the declared
length, values of type <type>character</type> will be space-padded;
values of type <type>character varying</type> will simply store the
shorter
string.
</para>
<note>
<para>
If one explicitly casts a value to
<type>character(<replaceable>n</>)</type> or <type>character
varying(<replaceable>n</>)</type>, then an overlength value will
be truncated to <replaceable>n</> characters without raising an
error. (This too is required by the <acronym>SQL</acronym>
standard.)
If one explicitly casts a value to <type>character
varying(<replaceable>n</>)</type> or
<type>character(<replaceable>n</>)</type>, then an over-length
value will be truncated to <replaceable>n</> characters without
raising an error. (This too is required by the
<acronym>SQL</acronym> standard.)
</para>
</note>
......@@ -870,14 +870,14 @@ CREATE TABLE <replaceable class="parameter">tablename</replaceable> (
</note>
<para>
The notations <type>char(<replaceable>n</>)</type> and
<type>varchar(<replaceable>n</>)</type> are aliases for
<type>character(<replaceable>n</>)</type> and <type>character
varying(<replaceable>n</>)</type>,
respectively. <type>character</type> without length specifier is
equivalent to <type>character(1)</type>; if <type>character
varying</type> is used without length specifier, the type accepts
strings of any size. The latter is a <productname>PostgreSQL</> extension.
The notations <type>varchar(<replaceable>n</>)</type> and
<type>char(<replaceable>n</>)</type> are aliases for <type>character
varying(<replaceable>n</>)</type> and
<type>character(<replaceable>n</>)</type>, respectively.
<type>character</type> without length specifier is equivalent to
<type>character(1)</type>; if <type>character varying</type> is used
without length specifier, the type accepts strings of any size. The
latter is a <productname>PostgreSQL</> extension.
</para>
<para>
......@@ -961,19 +961,18 @@ SELECT b, char_length(b) FROM test2;
<para>
There are two other fixed-length character types in
<productname>PostgreSQL</productname>, shown in <xref linkend="datatype-character-special-table">.
The <type>name</type> type
exists <emphasis>only</emphasis> for storage of internal catalog
names and is not intended for use by the general user. Its length
is currently defined as 64 bytes (63 usable characters plus terminator)
but should be referenced using the constant
<symbol>NAMEDATALEN</symbol>. The length is set at compile time
(and is therefore adjustable for special uses); the default
maximum length may change in a future release. The type
<type>"char"</type> (note the quotes) is different from
<type>char(1)</type> in that it only uses one byte of storage. It
is internally used in the system catalogs as a poor-man's
enumeration type.
<productname>PostgreSQL</productname>, shown in <xref
linkend="datatype-character-special-table">. The <type>name</type>
type exists <emphasis>only</emphasis> for storage of internal
catalog names and is not intended for use by the general user. Its
length is currently defined as 64 bytes (63 usable characters plus
terminator) but should be referenced using the constant
<symbol>NAMEDATALEN</symbol>. The length is set at compile time (and
is therefore adjustable for special uses); the default maximum
length may change in a future release. The type <type>"char"</type>
(note the quotes) is different from <type>char(1)</type> in that it
only uses one byte of storage. It is internally used in the system
catalogs as a poor-man's enumeration type.
</para>
<table id="datatype-character-special-table">
......
doc/src/sgml/sql.sgml
+ 6
− 5
View file @ 0eed62f3
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/sql.sgml,v 1.27 2002/08/28 14:35:36 momjian Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/sql.sgml,v 1.28 2003/01/15 18:01:05 momjian Exp $
-->
<chapter id="sql">
......@@ -1749,19 +1749,20 @@ CREATE TABLE SELLS
<listitem>
<para>
CHAR(<replaceable class="parameter">n</replaceable>):
fixed length character string of length
VARCHAR(<replaceable class="parameter">n</replaceable>):
varying length character string of maximum length
<replaceable class="parameter">n</replaceable>.
</para>
</listitem>
<listitem>
<para>
VARCHAR(<replaceable class="parameter">n</replaceable>):
varying length character string of maximum length
CHAR(<replaceable class="parameter">n</replaceable>):
fixed length character string of length
<replaceable class="parameter">n</replaceable>.
</para>
</listitem>
</itemizedlist>
</para>
</sect3>
......
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