cs186_fa07_mt1_sol 5

cs186_fa07_mt1_sol 5 - d[5 points Given the following...

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Unformatted text preview: d)[5 points] Given the following Relational Calculus statement: {B | BBooks(A1Authors(A1.birthYear>1920) (A2Authors(A2.birthYear>1920 A2.birthYear>A1.birthYear B.author=A2.name))} circle the Relational Algebra expressions that compute the same result. i) (A1, birthYear > 1920 Author) (A2(name2, c, birthYear, bp), birthYear > 1920 Author) isbn, title ,author (Books author=name2 (A2.birthYear > A1.birthYear(A1 A2))) ii) Books ( (Books birthYear < 1921 Author) (Books birthYear < 1920 Author) ) iii) All the above iv) None of the above Your answer: i i: 5/5 ...
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