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体验新版 GitCode,发现更多精彩内容 >>
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839cea88
编写于
10月 16, 2003
作者:
T
Tom Lane
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doc/src/sgml/datatype.sgml
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doc/src/sgml/datatype.sgml
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839cea88
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/datatype.sgml,v 1.12
5 2003/10/09 19:13:48 momjian
Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/datatype.sgml,v 1.12
6 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 b
e 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 b
y 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>
...
...
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