Neeraj Sharma, Liviu Perniu, Raul F. Chong, Abhishek Iyer's Database Fundamentals- First editon PDF

By Neeraj Sharma, Liviu Perniu, Raul F. Chong, Abhishek Iyer

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For example, for your relations the attributes domain could be: DEPARTMENTS DepNo Numeric(2,0) DepName Character(20) Manager Numeric(3,0) Address Character(50) Budget Numeric(10,2) EMPLOYEES ID Numeric(3,0) EmpName Character(30) Job Character(10) Salary Numeric(7,2) BirthDate Date DepNo Numeric(2,0) Each relation must have a primary key. The candidate keys for the DEPARMENTS relation are: DepNo and Manager. One of them will be the primary key of your relation and the other will be the alternate key.

Data Independence 13. C. Integration 14. D. Federation 15. E. None of the above 9. In the evolution of database management systems, in which stage would pureXML be? 16. A. Data independence Database Fundamentals 17. B. Extensibility 18. C. Optimization 19. D. Integration 20. E. None of the above 10. What is one key differentiator of DB2 on the Cloud? 21. A. It has a spatial extender 22. B. Its Database Partitioning Feature 23. C. Its pureXML technology 24. D. All of the above 25. E. None of the above 36 2 Chapter 2 – The relational data model In this chapter, we discuss the basics of the relational data model.

The formal notation for a join operation is: R ►◄S where is < The comparison operator can be <, >, <=, >=, =, <> and it depends on attributes domain. If relation R has attributes A1, A2, …, An and relation S has attributes B1, B2, …, Bm and attribute Ai and attribute Bj have the same underlying domain we can define a join operation between relation R and relation S on a join condition between attribute Ai and Bj.

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Database Fundamentals- First editon by Neeraj Sharma, Liviu Perniu, Raul F. Chong, Abhishek Iyer


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