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Tidy up boolean data type page

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by Thom Brown
This commit is contained in:
Peter Eisentraut 2010-07-24 12:17:35 +00:00
parent f581215660
commit caf2d69ee0
1 changed files with 30 additions and 13 deletions
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43
doc/src/sgml/datatype.sgml
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@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/datatype.sgml,v 1.251 2010/07/16 02:15:53 tgl Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/datatype.sgml,v 1.252 2010/07/24 12:17:35 petere Exp $ -->
<chapter id="datatype">
<title>Data Types</title>
@ -2759,13 +2759,34 @@ P <optional> <replaceable>years</>-<replaceable>months</>-<replaceable>days</> <
<para>
<productname>PostgreSQL</productname> provides the
standard <acronym>SQL</acronym> type <type>boolean</type>.
<type>boolean</type> can have one of only two states:
standard <acronym>SQL</acronym> type <type>boolean</type>;
see <xref linkend="datatype-boolean-table">.
The <type>boolean</type> type can have one of only two states:
<quote>true</quote> or <quote>false</quote>. A third state,
<quote>unknown</quote>, is represented by the
<acronym>SQL</acronym> null value.
</para>
<table id="datatype-boolean-table">
<title>Boolean Data Type</title>
<tgroup cols="3">
<thead>
<row>
<entry>Name</entry>
<entry>Storage Size</entry>
<entry>Description</entry>
</row>
</thead>
<tbody>
<row>
<entry><type>boolean</type></entry>
<entry>1 byte</entry>
<entry>state of true of false</entry>
</row>
</tbody>
</tgroup>
</table>
<para>
Valid literal values for the <quote>true</quote> state are:
<simplelist>
@ -2794,6 +2815,12 @@ P <optional> <replaceable>years</>-<replaceable>months</>-<replaceable>days</> <
(<acronym>SQL</acronym>-compliant) usage.
</para>
<para>
<xref linkend="datatype-boolean-example"> shows that
<type>boolean</type> values are output using the letters
<literal>t</literal> and <literal>f</literal>.
</para>
<example id="datatype-boolean-example">
<title>Using the <type>boolean</type> type</title>
@ -2813,16 +2840,6 @@ SELECT * FROM test1 WHERE a;
t | sic est
</programlisting>
</example>
<para>
<xref linkend="datatype-boolean-example"> shows that
<type>boolean</type> values are output using the letters
<literal>t</literal> and <literal>f</literal>.
</para>
<para>
<type>boolean</type> uses 1 byte of storage.
</para>
</sect1>
<sect1 id="datatype-enum">