Database Systems: The Complete Book is ideal for Database Systems and Database Design and Application courses offered at the junior, senior and graduate levels in Computer Science departments. A basic understanding of algebraic expressions and laws, logic, basic data structure, OOP concepts, and programming environments is implied.

The Complete Book of Option Spreads and Combinations is the definitive educational resource and reference guide for using option spreads and other common sense option strategies. This useful guide shows readers how to select the right strategy for their market outlook and risk/reward comfort level by describing the inner workings of each strategy and how they are affected by underlying market movements, implied volatility, and time decay. Even more importantly, readers will understand where each strategy performs well, and the market conditions where each should be avoided. Once the proper strategy is selected, readers will learn how to identify the best options to use based on "moneyness" and time to expiration. The companion website features tools including an option pricing tool and implied volatility calculator to help all traders implement these concepts effectively

"Complete IELTS. Bands 5-6.5. Student's Book" is for those who are at the upper-intermediate level, with a goal of 5-6.5. The book includes 8 topics along with exercises to help reinforce and improve skills when taking exams. Accompanying the book are References, grammar, vocabulary with annotations, examples, and practice tests at the end of each lesson to ensure that learners fully absorb the knowledge corresponding to each topic