A method for applying business rules to data stored in a table of a database. The stacked alignment mark comprises a first alignment mark and a second alignment mark. The motor is connected to a control device for performing mutual conversion between a rotation and stopping ratio andor the rotation speed of the motor and a musical characteristic signal, so that the music emitted by an output device synchronizes with the rotation and stopping ratio andor the rotation speed of the motor during working of the washing machine. A package retrieving apparatus includes a base, a vertical support interconnected with the base, and a package picker module.