     state_id SMALLINT NOT NULL,
     create_time DATETIME NOT NULL,
     create_by INTEGER NOT NULL,
-    UNIQUE link_relation_view (source_object_id, source_key, target_object_id, target_key, type_id)
+    CONSTRAINT link_relation_view UNIQUE (source_object_id, source_key, target_object_id, target_key, type_id)
 );
 -- ----------------------------------------------------------
 --  create table ticket_history

    change_time DATETIME NOT NULL,
    change_by INTEGER NOT NULL,
    PRIMARY KEY(id),
    UNIQUE salutation_name (name)
);
-- ----------------------------------------------------------
--  create table signature

    change_time DATETIME NOT NULL,
    change_by INTEGER NOT NULL,
    PRIMARY KEY(id),
    CONSTRAINT article_type_name UNIQUE (name)
);
-- ----------------------------------------------------------
--  create table article_sender_type
