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-$PostgreSQL: pgsql/doc/src/sgml/datatype.sgml,v 1.156 2005年03月13日 09:36:30 neilc Exp $

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<chapter id="datatype">

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>