TAILIEUCHUNG - An Introduction to Database Systems 8Ed - C J Date - Solutions Manual Episode 1 Part 4

Tham khảo tài liệu 'an introduction to database systems 8ed - c j date - solutions manual episode 1 part 4', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Chapter 5 T y p e s Principal Sections Values vs. variables Types vs. representations Type definition Operators Type generators SQL facilities General Remarks This chapter is new in this edition it s a greatly expanded and completely rewritten version of portions of Chapter 5 from the seventh edition . It opens with this remark Note You might want to give this chapter a once over lightly reading on a first pass. The chapter does logically belong here but large parts of the material aren t really needed very much prior to Chapter 20 in Part V and Chapters 25-27 in Part VI. From a teaching point of view therefore you might want to just take types as a given for now and go straight on to Chapter 6. If you do however you ll need to come back to this material before covering any of Chapters 20 and 25-27 and you ll need to be prepared for occasional questions prior to that point on the topics you ve temporarily skipped. As noted in the introduction in this manual to this part of the book it s this part above all others that I believe distinguishes this book from the competition. With respect to this chapter specifically one feature that sets the book apart from others including previous editions of this book is its emphasis on domains as types. The chapter goes into considerable detail on what s involved in defining and to some extent implementing such types associated operators included . The stated position that a domain and a type are the same thing permeates the entire book from this point forward in fact I prefer the term type and use domain mostly just in contexts where history demands it. Copyright c 2003 C. J. Date page So we re talking about type theory. Type theory is really a programming language topic however it s highly relevant to database theory too in fact it provides a basis on which to build such a theory . It might be characterized as the point where databases meet programming languages. It seems to me that the database community ignored this stuff

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