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-rw-r--r--doc/build/glossary.rst2
1 files changed, 2 insertions, 0 deletions
diff --git a/doc/build/glossary.rst b/doc/build/glossary.rst
index 595c2e8a8..d72b098fa 100644
--- a/doc/build/glossary.rst
+++ b/doc/build/glossary.rst
@@ -938,6 +938,8 @@ Glossary
http://en.wikipedia.org/wiki/Candidate_key
+ https://www.databasestar.com/database-keys/
+
primary key
primary key constraint