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AND/OR truth table needs another row IMHO.

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This commit is contained in:
Tom Lane 2001-02-19 00:01:18 +00:00
parent da84545d61
commit fa0cd643d2
1 changed files with 12 additions and 5 deletions
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17
doc/src/sgml/func.sgml
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@ -1,4 +1,4 @@
<!-- $Header: /cvsroot/pgsql/doc/src/sgml/func.sgml,v 1.52 2001/02/18 17:17:17 petere Exp $ --> <!-- $Header: /cvsroot/pgsql/doc/src/sgml/func.sgml,v 1.53 2001/02/19 00:01:18 tgl Exp $ -->
<chapter id="functions"> <chapter id="functions">
<title>Functions and Operators</title> <title>Functions and Operators</title>
@ -10,7 +10,7 @@
<citetitle>Programmer's Guide</citetitle>. The <citetitle>Programmer's Guide</citetitle>. The
<application>psql</application> commands <command>\df</command> and <application>psql</application> commands <command>\df</command> and
<command>\do</command> can be used to show the list of all actually <command>\do</command> can be used to show the list of all actually
available function and operators, respectively. available functions and operators, respectively.
</para> </para>
<para> <para>
@ -86,6 +86,13 @@
<entry>FALSE</entry> <entry>FALSE</entry>
<entry>NULL</entry> <entry>NULL</entry>
</row> </row>
<row>
<entry>NULL</entry>
<entry>NULL</entry>
<entry>NULL</entry>
<entry>NULL</entry>
</row>
</tbody> </tbody>
</tgroup> </tgroup>
</informaltable> </informaltable>
@ -218,8 +225,8 @@
<literal><replaceable>expression</replaceable> = NULL</literal> <literal><replaceable>expression</replaceable> = NULL</literal>
because NULL is not <quote>equal to</quote> NULL. (NULL represents because NULL is not <quote>equal to</quote> NULL. (NULL represents
an unknown value, so it is not known whether two unknown values are an unknown value, so it is not known whether two unknown values are
equal.) <productname>Postgres</productname> implicitly converts equal.) <productname>Postgres</productname> presently converts
<literal>= NULL</literal> clauses to <literal>IS NULL</literal> to <literal>x = NULL</literal> clauses to <literal>x IS NULL</literal> to
allow some broken client applications (such as allow some broken client applications (such as
<productname>Microsoft Access</productname>) to work, but this may <productname>Microsoft Access</productname>) to work, but this may
be discontinued in a future release. be discontinued in a future release.
@ -309,7 +316,7 @@
<row> <row>
<entry> <literal>!!</literal> </entry> <entry> <literal>!!</literal> </entry>
<entry>Factorial (left operator)</entry> <entry>Factorial (prefix operator)</entry>
<entry>!! 5</entry> <entry>!! 5</entry>
<entry>120</entry> <entry>120</entry>
</row> </row>