Database Design Using Entity-Relationship Diagrams phần 10 docx

... mapping design for mapping a relational database backward to an ER diagram performed when database is in use but no diagram exists Entity-relationship (E-R) diagrams are time-tested models for database ... become expert database designers. Because E- R diagrams are so fundamental to database design, this book is also an indispensable text for teaching computer science st...

Ngày tải lên: 13/08/2014, 12:21

... interesting example: EmpNo Name 101 Kaitlyn 102 Brenda 103 Beryl 104 Fred 105 Fred EmpNo Job Name 101 President Kaitlyn 104 Programmer Fred 103 Designer Beryl 103 Programmer Beryl type of ... cycle? Database Design Using Entity-Relationship Diagrams by Sikha Bagui and Richard Earp ISBN:0849315484 Auerbach Publications © 2003 (242 pages) With this comprehensive guide, d...

Ngày tải lên: 27/06/2014, 08:20

... interesting example: EmpNo Name 101 Kaitlyn 102 Brenda 103 Beryl 104 Fred 105 Fred EmpNo Job Name 101 President Kaitlyn 104 Programmer Fred 103 Designer Beryl 103 Programmer Beryl Data Models ... Salary 101 President Kaitlyn 50 104 Programmer Fred 30 103 Designer Beryl 35 103 Programmer Beryl 30 SSN Name School Location 101 David Alabama Tuscaloosa 102 Chrissy MSU Starkvill...

Ngày tải lên: 13/08/2014, 12:21

... you, asking that you design a database of parts for her company. Ms. Smith is the user. You are the database designer. What Ms. Smith tells you about the parts will be the database description. ... entirely on the circumstances that the database designer encounters — the desire of the "user" for which the database is being built. For example, in one database it ma...

Ngày tải lên: 13/08/2014, 12:21

... R., Database Systems , McGraw-Hill, New York, 1999. Elmasri, R. and Navathe, S.B., Fundamentals of Database Systems , 3rd ed., Addison-Wesley, Reading, MA, 2000. Lochovsky, F.H., Ed., Entity-Relationship ... develops steps 6 and 7 of the ER design methodology. Step 6 states the nature of a relationship in English, and step 7 discusses presenting the database (designed so far...

Ngày tải lên: 13/08/2014, 12:21

... the designed database to a naive user, and (2) checking the meaning on the designed database among the designers. The complete version of the English may eventually prove tiresome to a database ... Central, Lake). Draw the ER diagrams using the Chen- like model. Follow the methodology and include all English descriptions of your diagrams. Exercise 4.7 Refer to Figure 4 .10. Wh...

Ngày tải lên: 13/08/2014, 12:21

... Boca Raton, FL, 22 -10- 42, 1-14, May 2001. Elmasri, R. and Navathe, S.B., Fundamentals of Database Systems , 3rd ed., Addison-Wesley, Reading, MA, 2000. Kroenke, D.M., Database Processing, ... "as-designed" database to the user, complete with the English for entities, attributes, keys, and relationships. Refine the diagram as necessary. In summary our relational da...

Ngày tải lên: 13/08/2014, 12:21

... Figure 6 .10: An ER Diagram of the COURSE–INSTRUCTOR Database Finally, if no information about instructors were ever planned, then the first ER diagram (Figure 6 .10 ) would well describe the database. ... Entity Relationship (ER) Diagrams, " Data Base Management , Auerbach Publications, Boca Raton, FL, 22 -10- 43, 1–17, April 2000. Hawryszkiewycz, I., Database Analysis a...

Ngày tải lên: 13/08/2014, 12:21

... 1999. Teorey, T.J., Yang, D., and Fry, J.P., "A Logical Design Methodology for Relational Databases Using the Extended Entity-Relationship Model," ACM Computing Surveys , 18(2), ... turns out, will result in the same database as using a weak entity relationship, but provides an alternative way to present the information with more expressive diagrams, to include th...

Ngày tải lên: 13/08/2014, 12:21

... map ER diagrams to relational databases) that we developed throughout the book, and then discussed and developed a set of rules for reverse- engineering to ER diagrams from a relational database. ... shown in Figure 10. 2 . Figure 10. 2: Barker/Oracle-Like Notation: An ER Diagram with a Composite Attribute — name Optional versus Mandatory Attributes When designing a database...

Ngày tải lên: 13/08/2014, 12:21