Regards need help to decompose : best bet is not to be buried as this reduces the number of scavengers that can get to you, once they're finished then it will be insects, bacteria and fungi that will clear up the rest. If you have to be buried then don't go down to deep as temprature and oxygen levels decrease as you go down. An interesting novel on the subject is Being Dead by Jim Crace.
Regards tables : this doesn't look like a many to many relationship to me - why do you think it is. Can you print the whole coursework?