Description: 书籍类别（种类编号，种类名称）
读者（借书证编号，读者姓名，读者性别，读者种类，登记时期）
书籍（书籍编号，书籍名称，书籍类别，书记作者，出版社名称，出版日期，登记日期）
借阅（借书证编号，书籍编号，读者借书时间）
还书（借书证编号，书籍编号，读者还书时间）
罚款（借书证编号，读者姓名，借书证编号，书籍编号，读者借书时间）
以上通过关系代数方法的进行运算得到所需要的结果，在实验结果中可以看到。-Books category (type of number, type the name of) readers (library card number, name readers, readers of gender, the reader type, the registration period) books (book number, book title, book type, secretary of the authors, publishers name, date of publication, the date of registration ) borrow (library card number, book number, readers library time) books (library card number, book number, book readers time) Penalty (library card number, the reader name, library card number, book number, the reader time library ) The above method of relational algebra through the conduct of operations needed to get a result, the experimental results can be seen. Platform: |
Size: 777216 |
Author:liu |
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Description: 设有一个SPJ数据库，包括S，P，J，SPJ四个关系模式,用关系代数完成查询和用SQL完成各项操作-SPJ has a database, including S, P, J, SPJ four model, using relational algebra and the use of SQL query to complete the operation completed Platform: |
Size: 104448 |
Author:华夏 |
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Description: This book has brought together some of the best SQL experts
to address the important issues of writing efficient and cohesive
SQL statements. The topics include using advanced SQL
constructs and how to write programs that utilize complex
SQL queries. Not for the beginner, this book explores
complex time-based SQL queries, managing set operations in
SQL, and relational algebra with SQL. This is an indispensable
handbook for any developer who is challenged with writing
complex SQL inside applications. Platform: |
Size: 608256 |
Author:asd2010 |
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Description: 数据库中关系代数的优化算法，只是算法，不是完整的程序-Database optimization relational algebra, just algorithms, not the complete program Platform: |
Size: 1024 |
Author:江浩 |
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Description: 本书是数据库系统方面的经典教材之一,已被斯坦福大学、德克萨斯大学、耶鲁大学、康奈匀大学、伊利诺伊大学、印度理工学院等众多名校作为数据库系统课程的指定教材或推荐教材,其第3版的中文版也已被国内多所大学采用为本科生和研究生数据库课程的教材或主要教学参考书,收到了良了的效果。-What s New in the 6th Edition?
New running example of a university database:
More intuitive and motivating for students.
Illustrates more complex design tradeoffs in the database-design chapters.
All example tables collected in an appendix in the text and available online.
Larger database based on example schema available online for projects and assignments.
All chapters have been revised to reflect the latest advances in technology.
Chapter 2 (Relational Model) gives brief introduction to relational algebra. Technical details of the relational algebra and relational calculus are postponed to Chapter 6. Instructors may omit these topics if desired. Chapter 6 can be moved ahead and covered immediately after Chapter 2 for instructors preferring a more traditional sequence.
Chapters 3-- 5: Revised coverage of SQL
Greater attention to variants of SQL in actual systems.
More detail on SQL features.
Puts SQL first:
All SQL features covered in the book, including OLAP constructs Platform: |
Size: 10925056 |
Author:王天路 |
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Description: 用matlab实现了基于关系代数理论的关联规则挖掘算法ORAR-A the mining algorithm ORAR association rules based on relational algebra theory using matlab Platform: |
Size: 41984 |
Author:武丽明 |
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Description: 数据库相关PPT和资料，用于了解数据库的基本知识和情况。内容有SQL SERVER安全性管理，11- 分布式数据库，12-T-SQL编程，12-T-SQL编程_new，1-数据库发展史，2数据库系统结构，3关系代数，4－结构化查询语言SQL，5-规范化设计，6- 实体联系模型，7-数据库设计，8-数据库管理-Database PPT and information for the understanding of the basic knowledge of the database and circumstances. SQL SERVER content security management, 11 - distributed database, 12-T-SQL programming, 12-T-SQL programming _new - database development history of database system structure 3 relational algebra 4 - Structured Query language SQL, 5 - standardized design, 6 - entity relationship model, 7 - Database design - Database management Platform: |
Size: 2914304 |
Author:Roger |
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Description: 关系代数，关系演算和关系模型的学习课件，用于对数据库系统的入门指导。-Relational algebra, relational calculus and the relational model of learning courseware for introductory guide for database systems. Platform: |
Size: 1552384 |
Author:carol |
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Description: 关于关系数据库设计和MYSQL语言的PPT资料，详细讨论了逻辑结构的设计、关系代数、查询语言和并发控制-About Relational Database Design and MYSQL language PPT data, discussed in detail the logical structure design, relational algebra, query language and concurrency control Platform: |
Size: 11148288 |
Author:hezhoujie |
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Description: 由于关系代数运算的结果与其输入的类型一样，仍为关系，所以我们可以把多个关系代数运算组合成一个关系代数表达式。-As a result of relational algebra operations as its input type, still relationship, so we can combine multiple relational algebra into a relational algebra expression Platform: |
Size: 17408 |
Author:孙燕洁 |
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Description: Abstract:
Map-Reduce is a programming model that enables easy development of scalable parallel applications to process vast amounts of data on large clusters of commodity machines. Through a simple interface with two functions, map and reduce, this model facilitates parallel implementation of many real-world tasks such as data processing for search engines and machine learning. However, this model does not directly support processing multiple related heterogeneous datasets. While processing relational data is a common need, this limitation causes dif- ficulties and/or inefficiency when Map-Reduce is applied on relational operations like joins. We improve Map-Reduce into a new model called MapReduce-Merge. It adds to Map-Reduce a Merge phase that can efficiently merge data already partitioned and sorted (or hashed) by map and reduce modules. We also demonstrate that this new model can express relational algebra operators as well as implement several join algorithms.
Platform: |
Size: 152576 |
Author:Maddy |
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Search - relational algebra