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CS4433 Database Systems

Prepare for the upcoming database systems midterm exam by reviewing materials from "Introduction" to "Relational design." Study slides and textbook content, understand schemas, data, ER model with entities, attributes, relations, and constraints, relational algebra operators, relational design techniques, and normalization. Utilize peer discussions, TA consultations, and independent review. Keep calm and focus on comprehension and problem-solving. Avoid cheating for academic integrity. Good luck!

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CS4433 Database Systems

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  1. CS4433Database Systems Midterm Review

  2. Midterm Exam • Time: Monday 03/08/2019 1:30pm --- 2:20pm • Plan your time well • Venue: in-class exam • Closed book, closed note, but you can bring a one-page cheat sheet (A4, double side) • Plan your strategy well • No calculators or other electronic devices • Laptops, ipads, smart phones, etc. are prohibited • Any form of cheating on the examination will result in a zero grade, and will be reported to the university

  3. Midterm Exam • What will be covered? • From “Introduction” to “Relational design” • Materials in both the slides and the textbook • How to do well in the midterm exam? • Review the materials carefully and make sure you understand them • Reexamine the homework and make sure you can work out the solutions independently • Discuss with your peer students • Discuss with the TA and me • Relax 

  4. DB: What and Why? • Besides file systems and OS, why bother yet another so-called DBMS? • Schemas & Data • DDL & DML

  5. ER Model: Nothing but Drawing • Entities • Attributes • Relationships • One-one, one-many, many-many • Subclasses • Constraints • Keys, referential integrity, etc. • Weak Entity Set: Why & How?

  6. Relational Model: A Step Further • Relation Schema • Primary key, Foreign key, Unique, NULL, Default • Translating ER to Relations • Entities • Relationships (many-many, many-one, one-one) • Weak entity set • Subclass

  7. Relational Algebra: Let’s Do Math • Operators and operands • Set-based operators: intersection, subtraction, union… • Other basic operators: selection, projection,.. • Derived operators: division… • Cartesian product, theta-join, equi-join, natural join • Relational algebra expressions and expression trees • How to answer queries using relational algebra?

  8. Relational Design: Design it right • Motivation • Functional dependencies & keys • Armstrong axioms • Closures • Normal forms and decomposition algorithms • BCNF • Lossless or lossy? • 3NF • Functional-dependency preserving or not? • Don’t overdo it

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