Consider the ER schema for the MOVIES database in the figure 3.24.
Assume that MOVIES us a populated database. Actor is used as a generic term and includes actresses. Given the constraints shown in the ER schema, respond to the following statements with True, False or Maybe. Assign a response of Maybe to statements that, while not explicitly shown to be True, cannot be proven False based on the schema as shown. Justify each answer.
a. There are no actors in the database that have been in no movies.
b. There are some Actors who have acted in more than ten movies.
c. Some actors have done a lead role in multiple movies. Maybe.
d. A movie can have only a maximum of two lead actors.
e. Every director has been an actor in some movie.
f. No producer has ever been an actor.
g. A producer cannot be an actor in some other movie.
h. There are movies with more than a dozen actors.
i. Some producers have been a director as well.
j. Most movies have one director and one producer.
j. Some movies have one director and several producers.
j. There are some actors that have done a lead role, directed a move and produced some movies.
j. No movie has a director that also acted in that movie.
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