factory (including the name and the name of the director)
needs to establish a management database to store the following
information: I) A factory has a number of workshops, each workshop
has the workshop number, workshop director's name, address and
telephone number. II) There are more than one workers in each
workshop, and each worker has a staff number, name, age, sex type
of work. III) A workshop produces a variety of products, each of
which has the product number...