Q&A

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Problem 6.24 (just the tuple rational part) in the old 3rd edition of the textbook (page 319).
For Question 6.16(e) and 6.16(f) is it possible to use the division and difference operations, or should a for all quantifier be used?
No division and no diffence operations. Just logical quantifiers.
For question 6.24, there are several problems if being done in relational algebra or SQL would require the use of aggregate functions; however, in the notes and in the book there does not appear to be a similar thing for relational calculus. Is this true?
Yes, it is true. That is the reason the problem asks to consider just parts a, b, c, e, f, i, and j.