EXAM2 Solution

# EXAM2 Solution - Information and Database Management...

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Exercise 1 (Knowledge Questions) [20 points] 1. Express the natural join operator in terms of other basic operations: { σ , π , , , –, ×} [5 points] Answer: R S ≡ π _ b ( σ _ a (R × S)) where a : condition where attributes with similar names are matched up, and b : list of attributes, with duplicates removed. 2. Describe in your own words how grouping works and how its interplay with aggregate functions is. [5 points] 3. Briefly explain the various Join operations in Relational Algebra. [10 points] [Refer to class notes.]
Exercise 2 (Relational Algebra) [30 points] Consider the following schema:

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## This note was uploaded on 09/10/2008 for the course CIS 4301 taught by Professor Schneider during the Spring '08 term at University of Florida.

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EXAM2 Solution - Information and Database Management...

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