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

... 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