Fundamentals of Database Systems (7th Edition)
Language: English
Pages: 1272
ISBN: 0133970779
Format: PDF / Kindle (mobi) / ePub
For database systems courses in Computer Science
This book introduces the fundamental concepts necessary for designing, using, and implementing database systems and database applications. Our presentation stresses the fundamentals of database modeling and design, the languages and models provided by the database management systems, and database system implementation techniques.
The book is meant to be used as a textbook for a one- or two-semester course in database systems at the junior, senior, or graduate level, and as a reference book. The goal is to provide an in-depth and up-to-date presentation of the most important aspects of database systems and applications, and related technologies. It is assumed that readers are familiar with elementary programming and data-structuring concepts and that they have had some exposure to the basics of computer organization.
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The join attribute. The resulting relation is illustrated in Figure 07.14(a). In the PROJ_DEPT relation, each tuple combines a PROJECT tuple with the DEPARTMENT tuple for the department that controls the project, but only one join attribute is kept. 1 Page 185 of 893 If the attributes on which the natural join is specified have the same names in both relations, renaming is unnecessary. For example, to apply a natural join on the DNUMBER attributes of DEPARTMENT and DEPT_LOCATIONS, it is.
In the rename operation—for the resulting relation R. If no renaming is applied, then the attributes of the resulting relation that correspond to the function list will each be the concatenation of the function name with the attribute name in the form
Grade for a student. The data in the database at a particular moment in time is called a database state or snapshot. It is also called the current set of occurrences or instances in the database. In a given database state, each schema construct has its own current set of instances; for example, the STUDENT construct will contain the set of individual student entities (records) as its instances. Many database states can be constructed to correspond to a particular database schema. Every time we.
Least two) to hold file blocks from disk, and retrieves the file header. Sets the file pointer to the beginning of the file. Reset: Sets the file pointer of an open file to the beginning of the file. Find (or Locate): Searches for the first record that satisfies a search condition. Transfers the block containing that record into a main memory buffer (if it is not already there). The file pointer points to the record in the buffer and it becomes the current record. Sometimes, different verbs are.
..........................................................................................................755 27.3 Mobile Databases .................................................................................................................760 27.4 Geographic Information Systems .........................................................................................764 27.5 Genome Data Management.