Index: branches/version-2_12-dev/html/install/sql/create_table_mysql.sql
===================================================================
--- branches/version-2_12-dev/html/install/sql/create_table_mysql.sql	(revision 21701)
+++ branches/version-2_12-dev/html/install/sql/create_table_mysql.sql	(revision 21702)
@@ -419,5 +419,6 @@
     category_id int NOT NULL,
     product_count int NOT NULL,
-    create_date timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP
+    create_date timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    PRIMARY KEY (category_id)
 );
 
@@ -425,5 +426,6 @@
     category_id int NOT NULL,
     product_count int,
-    create_date timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP
+    create_date timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    PRIMARY KEY (category_id)
 );