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Minor copy-editing.

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This commit is contained in:
Tom Lane 2003-10-16 04:52:21 +00:00
parent a9c1ff66da
commit 839cea8814
1 changed files with 13 additions and 11 deletions
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doc/src/sgml/datatype.sgml
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@ -1,5 +1,5 @@
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/datatype.sgml,v 1.125 2003/10/09 19:13:48 momjian Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/datatype.sgml,v 1.126 2003/10/16 04:52:21 tgl Exp $
-->
<chapter id="datatype">
@ -682,7 +682,7 @@ NUMERIC
<para>
The data types <type>serial</type> and <type>bigserial</type>
are not true types, but merely
a notational convenience for setting up identifier columns
a notational convenience for setting up unique identifier columns
(similar to the <literal>AUTO_INCREMENT</literal> property
supported by some other databases). In the current
implementation, specifying
@ -722,10 +722,10 @@ CREATE TABLE <replaceable class="parameter">tablename</replaceable> (
</note>
<para>
To use a <type>serial</type> column to insert the next value of
the sequence into the table, specify that the <type>serial</type>
column should be assigned the default value. This can be done
either be excluding from the column from the list of columns in
To insert the next value of the sequence into the <type>serial</type>
column, specify that the <type>serial</type>
column should be assigned its default value. This can be done
either by excluding the column from the list of columns in
the <command>INSERT</command> statement, or through the use of
the <literal>DEFAULT</literal> keyword.
</para>
@ -741,8 +741,8 @@ CREATE TABLE <replaceable class="parameter">tablename</replaceable> (
</para>
<para>
The sequence created by a <type>serial</type> type is
automatically dropped when the owning column is dropped and
The sequence created for a <type>serial</type> column is
automatically dropped when the owning column is dropped, and
cannot be dropped otherwise. (This was not true in
<productname>PostgreSQL</productname> releases before 7.3. Note
that this automatic drop linkage will not occur for a sequence
@ -751,9 +751,11 @@ CREATE TABLE <replaceable class="parameter">tablename</replaceable> (
dependency link.) Furthermore, this dependency between sequence
and column is made only for the <type>serial</> column itself; if
any other columns reference the sequence (perhaps by manually
calling the <function>nextval</>) function), they may be broken
if the sequence is removed. Using <type>serial</> columns in
fashion is considered bad form.
calling the <function>nextval</> function), they will be broken
if the sequence is removed. Using a <type>serial</> column's sequence
in such a fashion is considered bad form; if you wish to feed several
columns from the same sequence generator, create the sequence as an
independent object.
</para>
</sect2>
</sect1>