--- a/oracle.rst	Mon Jan 22 19:15:18 2018 +0200
+++ b/oracle.rst	Mon Jan 22 19:19:51 2018 +0200
@@ -215,6 +215,9 @@
   select dump(date '2009-08-07') from dual;
   select dump(sysdate) from dual;
 
+https://dba.stackexchange.com/questions/11047/how-to-retrieve-foreign-key-constraints-data/
+  How to retrieve foreign key constraints data.
+
 Managing data files location
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