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Mention the actual stored size of NUMERIC values, per David Fetter.

This commit is contained in:
Tom Lane 2005-05-01 15:54:46 +00:00
parent 628c0893fd
commit 768eaf1416
1 changed files with 4 additions and 2 deletions
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6
doc/src/sgml/datatype.sgml
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@ -1,5 +1,5 @@
<!--
$PostgreSQL: pgsql/doc/src/sgml/datatype.sgml,v 1.156 2005/03/13 09:36:30 neilc Exp $
$PostgreSQL: pgsql/doc/src/sgml/datatype.sgml,v 1.157 2005/05/01 15:54:46 tgl Exp $
-->
<chapter id="datatype">
@ -505,7 +505,9 @@ NUMERIC
trailing zeroes. Thus, the declared precision and scale of a column
are maximums, not fixed allocations. (In this sense the <type>numeric</>
type is more akin to <type>varchar(<replaceable>n</>)</type>
than to <type>char(<replaceable>n</>)</type>.)
than to <type>char(<replaceable>n</>)</type>.) The actual storage
requirement is two bytes for each group of four decimal digits,
plus eight bytes overhead.
</para>
<para>