Database Systems: A Practical Approach to Design, Implementation, and Management (6th Edition)
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Database Systems is ideal for a one- or two-term course in database management or database design in an undergraduate or graduate level course. With its comprehensive coverage, this book can also be used as a reference for IT professionals.
This best-selling text introduces the theory behind databases in a concise yet comprehensive manner, providing database design methodology that can be used by both technical and non-technical readers. The methodology for relational Database Management Systems is presented in simple, step-by-step instructions in conjunction with a realistic worked example using three explicit phases—conceptual, logical, and physical database design.
Teaching and Learning Experience
This program presents a better teaching and learning experience–for you and your students. It provides:
- Database Design Methodology that can be Used by Both Technical and Non-technical Readers
- A Comprehensive Introduction to the Theory behind Databases
- A Clear Presentation that Supports Learning
cannot occur. We discuss concurrency control in Chapter 20. Improved backup and recovery services Many file-based systems place the responsibility on the user to provide measures to protect the data from failures to the computer system or application program. This may involve taking a nightly backup of the data. In the event of a failure during the next day, the backup is restored and the work that has taken place since this backup is lost and has to be re-entered. In contrast, modern DBMSs
server. This three-tier architecture has proved more appropriate for some environments, such as the Internet and corporate intranets where a Web browser can be used as a client. It is also an important architecture for Transaction Processing Monitors, as we discuss next. 2.6.5 Transaction Processing Monitors TP Monitor A program that controls data transfer between clients and servers in order to provide a consistent environment, particularly for online transaction processing (OLTP). Complex
data model. 3.3 Describe the differences between a relation and a relation schema. What is a relational database schema? 3.4 Discuss the properties of a relation. 3.5 Discuss the differences between the candidate keys and the primary key of a relation. Explain what is meant by a foreign key. How do foreign keys of relations relate to candidate keys? Give examples to illustrate your answer. 3.6 Define the two principal integrity rules for the relational model. Discuss why it is desirable to
If a predicate contains a variable, as in ‘x is a member of staff’, there must be an associated range for x. When we substitute some values of this range for x, the proposition may be true; for other values, it may be false. For example, if the range is the set of all people and we replace x by John White, the proposition ‘John White is a member of staff’ is true. If we replace x by the name of a person who is not a member of staff, the proposition is false. If P is a predicate, then we can write
lName, position FROM Staff WHERE position = ‘Manager’ OR position = ‘Supervisor’; However, the IN test provides a more efficient way of expressing the search condition, particularly if the set contains many values. Example 5.9 Pattern match search condition (LIKE/NOT LIKE) Find all owners with the string ‘Glasgow’ in their address. For this query, we must search for the string ‘Glasgow’ appearing somewhere within the address column of the PrivateOwner table. SQL has two special pattern-matching