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Commit81efc82

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This patch fixes a minor inaccuracy in the documentation: NOT NULL is
not synonymous with CHECK (xxx IS NOT NULL) -- for example, considerALTER TABLE ADD PRIMARY KEY, which checks for 'NOT NULL', not a checkconstraint.Neil Conway
1 parentf1c1685 commit81efc82

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‎doc/src/sgml/ref/create_table.sgml

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@@ -1,5 +1,5 @@
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<!--
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$Header: /cvsroot/pgsql/doc/src/sgml/ref/create_table.sgml,v 1.55 2002/05/18 15:44:47 petere Exp $
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$Header: /cvsroot/pgsql/doc/src/sgml/ref/create_table.sgml,v 1.56 2002/09/02 06:20:53 momjian Exp $
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PostgreSQL documentation
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-->
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@@ -247,9 +247,7 @@ and <replaceable class="PARAMETER">table_constraint</replaceable> is:
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<term><literal>NOT NULL</></term>
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<listitem>
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<para>
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The column is not allowed to contain NULL values. This is
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equivalent to the column constraint <literal>CHECK (<replaceable
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class="PARAMETER">column</replaceable> NOT NULL)</literal>.
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The column is not allowed to contain NULL values.
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</para>
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</listitem>
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</varlistentry>

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