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Author: C. Date Publisher: "O'Reilly Media, Inc." ISBN: 1449316409 Category : Computers Languages : en Pages : 447
Book Description
SQL is full of difficulties and traps for the unwary. You can avoid them if you understand relational theory, but only if you know how to put the theory into practice. In this insightful book, author C.J. Date explains relational theory in depth, and demonstrates through numerous examples and exercises how you can apply it directly to your use of SQL. This second edition includes new material on recursive queries, “missing information” without nulls, new update operators, and topics such as aggregate operators, grouping and ungrouping, and view updating. If you have a modest-to-advanced background in SQL, you’ll learn how to deal with a host of common SQL dilemmas. Why is proper column naming so important? Nulls in your database are causing you to get wrong answers. Why? What can you do about it? Is it possible to write an SQL query to find employees who have never been in the same department for more than six months at a time? SQL supports “quantified comparisons,” but they’re better avoided. Why? How do you avoid them? Constraints are crucially important, but most SQL products don’t support them properly. What can you do to resolve this situation? Database theory and practice have evolved since the relational model was developed more than 40 years ago. SQL and Relational Theory draws on decades of research to present the most up-to-date treatment of SQL available. C.J. Date has a stature that is unique within the database industry. A prolific writer well known for the bestselling textbook An Introduction to Database Systems (Addison-Wesley), he has an exceptionally clear style when writing about complex principles and theory.
Author: C. Date Publisher: "O'Reilly Media, Inc." ISBN: 1449316409 Category : Computers Languages : en Pages : 447
Book Description
SQL is full of difficulties and traps for the unwary. You can avoid them if you understand relational theory, but only if you know how to put the theory into practice. In this insightful book, author C.J. Date explains relational theory in depth, and demonstrates through numerous examples and exercises how you can apply it directly to your use of SQL. This second edition includes new material on recursive queries, “missing information” without nulls, new update operators, and topics such as aggregate operators, grouping and ungrouping, and view updating. If you have a modest-to-advanced background in SQL, you’ll learn how to deal with a host of common SQL dilemmas. Why is proper column naming so important? Nulls in your database are causing you to get wrong answers. Why? What can you do about it? Is it possible to write an SQL query to find employees who have never been in the same department for more than six months at a time? SQL supports “quantified comparisons,” but they’re better avoided. Why? How do you avoid them? Constraints are crucially important, but most SQL products don’t support them properly. What can you do to resolve this situation? Database theory and practice have evolved since the relational model was developed more than 40 years ago. SQL and Relational Theory draws on decades of research to present the most up-to-date treatment of SQL available. C.J. Date has a stature that is unique within the database industry. A prolific writer well known for the bestselling textbook An Introduction to Database Systems (Addison-Wesley), he has an exceptionally clear style when writing about complex principles and theory.
Author: Concha Delgado-Gaitan University of California, Davis, USA. Publisher: Routledge ISBN: 1134077939 Category : Education Languages : en Pages : 179
Book Description
In this study the essence of literacy is observed in the Portillo Community when working-class Mexican-American parents empowered each other by sharing their experiences to help their children in school.
Author: Eva Irene Brooks Publisher: Springer Nature ISBN: 3030784487 Category : Technology & Engineering Languages : en Pages : 215
Book Description
This book constitutes the refereed post-conference proceedings the 5th EAI International Conference on DLI 2020, Design, Leaning and Innovation, which took place in December 2020. Due to COVID-19 pandemic the conference was held virtually. The 14 revised full papers presented were carefully selected from 40 submissions and are organized in four thematic sessions on: digital technologies and learning; designing for innovation; digital games, gamification and robots; designs for innovative learning.
Author: Edgar Galindo Publisher: Frontiers Media SA ISBN: 2889455521 Category : Languages : en Pages : 130
Book Description
This book is devoted to an increasingly important educational problem in the modern societies: school achievement and failure. School failure is presently a problem in developed as well as in developing countries. In the Spanish and Portuguese speaking countries in Europe and Latin America, school achievement and failure is consequently an important topic of political, social and scientific discussion. The following papers revise the latest research in the field, from the perspective of Psychology.
Author: C. Date
Author: C. Date
Author: Concha Delgado-Gaitan University of California, Davis, USA.
Author: American Council on Education
Author: American Council on Education
Author: Eva Irene Brooks
Author: 
Author: 
Author: American Council on Education
Author: Edgar Galindo
Author: United States. Department of State