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Relational Algebra schema problem

Relational Algebra schema problem

drewvs	19 Oct, 2009 - 09:26 AM Post #1
New D.I.C Head Joined: 18 Oct, 2009 Posts: 6	I am reviewing for an exam and I am stuck on the last question of the chapter and would like some guidance. The question is as follows: Consider the following relational schema: employee(empno,name,office,age) books(isbn, title, authors, publisher) loan(empno,isbn,date) Write the following queries in relational algebra a. Find the names of employees who have borrowed a book published by McGraw-Hill. b. Find the names of employees who have borrowed all books published by McGraw-Hill. So far this is what I have: a.PROJECT name(PROJECT books.publisher) NATURA JOIN employee The above answer is wrong, any help would be appreciated. I would prefer an explanation as well as an answer, I need to know how to do it! Thanks, Drew
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drewvs Relational Algebra schema problem 19 Oct, 2009 - 09:26 AM

baavgai I don't know of any databases that actually wo... 19 Oct, 2009 - 10:10 AM

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