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4707MidFall07 - CSCI 4707 Mid-Semester Examination Fall...

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CSCI 4707 Mid-Semester Examination, Fall 2007 Time Allocated: 75 minutes Maximum Points: 100 1. This is a CLOSED book examination. Personal copies of textbook and class notes can not be used. However, each student may bring one 8.5inch by 11inch sheet of summary notes. Please do not share this sheet with other students. Laptop computers and calculators cannot be used. 2. There are 4 questions. Use a blue book to answer these questions. Start answer to each part of a question on a fresh page. Put name, student id, email address, class group, course id, course name, semester, and year on the cover page. 3. All questions about SQL refer to SQL2 or SQL3 standard. Question 1. Answer the following questions. Q1a. (4 pts) When is it permissible for foreign keys to store null values (50 words or less)? Use conceptual data model terminology to describe this situation. Q1b. (16 pts) Given two relations R1 and R2, where R1 contains N1 tuples, R2 contains N2 tuples, and N2>N1>0. Give the minimum and maximum possible sizes (in tuples) for the resulting relation produced by each of the following relational algebra expressions. In each case, state any assumptions about the schemas for R1 and R2 needed to make the expression meaningful:
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