Update wording about information schema and name which views potentially

can have duplicates, per request from Tom.

diff --git a/doc/src/sgml/information_schema.sgml b/doc/src/sgml/information_schema.sgml
index 21e4f98913a5cd47408af82f1fb44b8e1a4c4de4..aa6f852a8a3f7ad11586f5726e758a2b9cd65786 100644 (file)
--- a/doc/src/sgml/information_schema.sgml
+++ b/doc/src/sgml/information_schema.sgml
@@ -32,6 +32,16 @@
    automatically-generated constraint names avoid duplicates in the
    same schema, but users can specify such duplicate names.
   
+
+  
+   This problem can appear when querying information schema views like
+   referential_constraints, check_constraints,
+   domain_constraints, and
+   check_constraint_routine_usage.  Some other views have
+   similar issues but contain the table name to help distinguish
+   duplicate rows, e.g. table_constraints,
+   constraint_table_usage, constraint_column_usage.
+