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This patch fixes a minor inaccuracy in the documentation: NOT NULL is

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not synonymous with CHECK (xxx IS NOT NULL) -- for example, consider
ALTER TABLE ADD PRIMARY KEY, which checks for 'NOT NULL', not a check
constraint.

Neil Conway
This commit is contained in:
Bruce Momjian 2002-09-02 06:20:53 +00:00
parent f1c1685b39
commit 81efc82608
1 changed files with 2 additions and 4 deletions
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6
doc/src/sgml/ref/create_table.sgml
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@ -1,5 +1,5 @@
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/ref/create_table.sgml,v 1.55 2002/05/18 15:44:47 petere Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/ref/create_table.sgml,v 1.56 2002/09/02 06:20:53 momjian Exp $
PostgreSQL documentation
-->
@ -247,9 +247,7 @@ and <replaceable class="PARAMETER">table_constraint</replaceable> is:
<term><literal>NOT NULL</></term>
<listitem>
<para>
The column is not allowed to contain NULL values. This is
equivalent to the column constraint <literal>CHECK (<replaceable
class="PARAMETER">column</replaceable> NOT NULL)</literal>.
The column is not allowed to contain NULL values.
</para>
</listitem>
</varlistentry>