Question: Consider the following Database: 1. How many tuples will be returned by the following relational algebra query? book_title(book) 2. What question does the following expression

Consider the following Database:

Consider the following Database: 1. How many tuples will be returned by

1. How many tuples will be returned by the following relational algebra query?

the following relational algebra query? book_title(book) 2. What question does the following book_title(book)

2. What question does the following expression answer?

expression answer? author_id (author) editor(book) Pubs Database State r(author rlauthor _pub author _{author_id} (author) id first name last name author_id |publid |author_positiorn John Dennis Ken Claude _editor(book)

Pubs Database State r(author rlauthor _pub author id first name last name author_id |publid |author_positiorn John Dennis Ken Claude Alan Alonzo McCarthy Ritchie Thompson Shannor Turing Church White Vardi Batty 2 erry Moshe Roy 9 r(book) r(pub) book id book title month editor pub_id title book id year 19608 1974 8 19482 April CACM CACMJuly BST LMS Mind AMS AAA NIPS LISP Unix Info Theory July November 19367 October1950 NULL5 Month July July Turing Machines 4 Turing Test Lambda Calculus 6 1941 NULL6 20129 20129

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