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I was recently surprised to find that EXTRACT's day of the week

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numbering is different than TO_CHAR's ditto. EXTRACT starts at 0==Sunday
while TO_CHAR starts at 1==Sunday.

A suggestion for two documentation notes is attached as a patch to
current CVS HEAD.

Troels Arvin
This commit is contained in:
Bruce Momjian 2004-12-21 01:02:28 +00:00
parent 93b808e9c9
commit bbb2e21e14
1 changed files with 13 additions and 1 deletions
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14
doc/src/sgml/func.sgml
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@ -1,5 +1,5 @@
<!--
$PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.230 2004/12/13 18:05:08 petere Exp $
$PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.231 2004/12/21 01:02:28 momjian Exp $
PostgreSQL documentation
-->
@ -4412,6 +4412,13 @@ substring('foobar' from 'o(.)b') <lineannotation>o</lineannotation>
1230 microseconds = 2.021230 seconds.
</para>
</listitem>
<listitem>
<para><function>to_char</function>'s day of the week numbering
(see the 'D' formatting pattern) is different from that of the
<function>extract</function> function.
</para>
</listitem>
</itemizedlist>
</para>
@ -5146,6 +5153,11 @@ SELECT EXTRACT(DECADE FROM TIMESTAMP '2001-02-16 20:38:40');
SELECT EXTRACT(DOW FROM TIMESTAMP '2001-02-16 20:38:40');
<lineannotation>Result: </lineannotation><computeroutput>5</computeroutput>
</screen>
<para>
Note that <function>extract</function>'s day of the week numbering is
different from that of the <function>to_char</function> function.
</para>
</listitem>
</varlistentry>