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Document that an SQL-standard-compliant query that expects a unique row

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from information_schema.referential_constraints might return several in
Postgres because we allow duplicate-named constraints in the same
schema.
This commit is contained in:
Bruce Momjian 2011-02-19 18:21:03 -05:00
parent b05186f8a4
commit e07ae21f7e
1 changed files with 13 additions and 0 deletions
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doc/src/sgml/information_schema.sgml
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@ -3211,6 +3211,19 @@ ORDER BY c.ordinal_position;
</tbody>
</tgroup>
</table>
<note>
<para>
The SQL standard requires constraint names to be unique within a
schema; <productname>PostgreSQL</productname>, however, does not
enforce this restriction. If duplicate-named constraints are
stored in the same <productname>PostgreSQL</productname> schema, a
standard-compliant query that expects to return one row might
return several, one for each matching constraint stored in the
specified schema.
</para>
</note>
</sect1>
<sect1 id="infoschema-role-column-grants">