(Or “multi-part key”, “concatenated key”) A key which consists of more than one attribute of the body of information (e.g. database “record”) it identifies.
noun 1. a leaf composed of a number of leaflets on a common stalk, arranged either palmately, as the fingers of a hand, or pinnately, as the leaflets of a fern; the leaflets themselves may be compound. noun 1. a leaf consisting of two or more leaflets borne on the same leafstalk compound leaf A […]
noun 1. an optical system consisting of two or more lenses having the same axis. noun 1. a lens consisting of more than one component lens compound lens See lens.
noun 1. a magnet consisting of two or more separate magnets placed together with like poles pointing in the same direction.
noun 1. an optical instrument for forming magnified images of small objects, consisting of an objective lens with a very short focal length and an eyepiece with a longer focal length, both lenses mounted in the same tube. noun 1. an instrument for magnifying small objects, consisting of a lens of short focal length for […]