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Add documentaiotn mention that constraint names can be sentences that 

can convey information to clients on constraint violation.
This commit is contained in:
Bruce Momjian 2006-01-16 19:50:03 +00:00
parent b06e6f1a9a
commit 9200318972
1 changed files with 5 additions and 2 deletions
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7
doc/src/sgml/ref/create_table.sgml
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@ -1,5 +1,5 @@
<!--
$PostgreSQL: pgsql/doc/src/sgml/ref/create_table.sgml,v 1.96 2005/11/01 21:09:50 tgl Exp $
$PostgreSQL: pgsql/doc/src/sgml/ref/create_table.sgml,v 1.97 2006/01/16 19:50:03 momjian Exp $
PostgreSQL documentation
-->
@ -293,7 +293,10 @@ and <replaceable class="PARAMETER">table_constraint</replaceable> is:
<term><literal>CONSTRAINT <replaceable class="PARAMETER">constraint_name</replaceable></literal></term>
<listitem>
<para>
An optional name for a column or table constraint. If not specified,
An optional name for a column or table constraint. If the
constraint is violated, the constraint name is present in error messages,
so constraint names like "col must be positive" can be used to communicate
helpful constraint information to client applications. If not specified,
the system generates a name.
</para>
</listitem>