A table includes a table top with at least one collapsible leg which includes a top tube, a middle tube and a bottom tube. A connector is connected to the underside of the table top and the top end of the outer tube. An inner threaded rod is connected to a motor which is connected to the connector. An outer threaded rod is movably mounted to outside of the inner threaded rod. A top nut is fixed to the middle tube and threadedly connected to the inner threaded rod. A bottom nut is connected to the bottom tube and threadedly connected to the outer threaded rod. When the motor drives the inner threaded rod, the outer threaded rod is moved relative to the inner threaded rod so that the middle tube moves relative to the top tube, and the bottom tube moves relative to the middle tube.