# Table-level constraint

    [CONSTRAINT constraint-Name]
    {
        CHECK (searchCondition) |
        {
            PRIMARY KEY ( Simple-column-Name [ , Simple-column-Name ]* ) |
            UNIQUE ( Simple-column-Name [ , Simple-column-Name ]* ) |
            FOREIGN KEY ( Simple-column-Name [ , Simple-column-Name ]* )
                REFERENCES clause
        }
    }

Parent topic: CONSTRAINT clause
Related reference
Column-level-constraint
References specification
searchCondition