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Add documentation about the issues of casting MONEY to/from numeric 

types.
This commit is contained in:
Bruce Momjian 2007-11-27 05:49:58 +00:00
parent 91e95588af
commit ee13b734fa
1 changed files with 9 additions and 1 deletions
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doc/src/sgml/datatype.sgml
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@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/datatype.sgml,v 1.217 2007/11/21 04:01:37 tgl Exp $ --> <!-- $PostgreSQL: pgsql/doc/src/sgml/datatype.sgml,v 1.218 2007/11/27 05:49:58 momjian Exp $ -->
<chapter id="datatype"> <chapter id="datatype">
<title id="datatype-title">Data Types</title> <title id="datatype-title">Data Types</title>
@ -842,6 +842,14 @@ ALTER SEQUENCE <replaceable class="parameter">tablename</replaceable>_<replaceab
floating-point literals, as well as <quote>typical</quote> floating-point literals, as well as <quote>typical</quote>
currency formatting, such as <literal>'$1,000.00'</literal>. currency formatting, such as <literal>'$1,000.00'</literal>.
Output is generally in the latter form but depends on the locale. Output is generally in the latter form but depends on the locale.
Non-quoted numeric values can be converted to <type>money</type> by
casting the numeric value to <type>text</type> and then
<type>money</type>:
<programlisting>
SELECT 1234::text::money;
</programlisting>
There is no simple way of doing the reverse; casting a <type>money</type> value to a
numeric type.
</para> </para>
<para> <para>