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Reword information_schema duplicate constraint warning text.

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This commit is contained in:
Bruce Momjian 2011-02-22 09:06:18 -05:00
parent 2e852e541c
commit edb382179d
1 changed files with 8 additions and 7 deletions
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15
doc/src/sgml/information_schema.sgml
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@ -23,13 +23,14 @@
<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 matching
constraint row might return several, one row for each matching
constraint stored in the specified schema.
When querying the database for constraint information, it is possible
for a standard-compliant query that expects to return one row to
return several. This is because the SQL standard requires constraint
names to be unique within a schema, but
<productname>PostgreSQL</productname> does not enforce this
restriction. <productname>PostgreSQL</productname>
automatically-generated constraint names avoid duplicates in the
same schema, but users can specify such duplicate names.
</para>
</note>