DATABASE SYSTEMS (phần 7) pdf

... appropriate SQL DDL statements to define the database. 8.8. Repeat Exercise 8.7, but use the AIRLINE database schema of Figure 5.8. 8.9. Consider the LIBRARY relational database schema of Figure 6.12. Choose the appro- priate action (reject, ... updating, and the specification of views. Most database systems have an interactive interface where these SQL commands can be typed directl...

Ngày tải lên: 07/07/2014, 06:20

... a more accurate description than query optimization. For lower-level navigational database languages in legacy systems- such as the network DML or the hierarchical HDML (see Appendixes E and F)-the programmer ... Textbooks on file structures including Wirth (1972), Claybrook (1983), Smith and Barnes (19 87), Miller (19 87), and Salzberg (1988) discuss indexing in detail and may be consulte...

Ngày tải lên: 07/07/2014, 06:20

... general, most documents extracted from a database will only use a subset of the attributes, entity types, and relationships in the database. In this example, the subset of the database that is needed is shown in ... useful, data mining must be carried out efficiently on large files and databases. To date, it is not well- integrated with database management systems. We will briefly re...

Ngày tải lên: 07/07/2014, 06:20

... Q22 When comparing a relational database with an object-oriented database, which of the following statements correctly describes the object-oriented database? a) It can express real world ... precision ratio used as measures in evaluating information retrieval systems, such as document retrieval systems and data retrieval systems? Here, A , B and C indicate the followin...

Ngày tải lên: 24/08/2012, 15:44

... Backup/Restore feature (i) Database backup and restoration can be done for the entire database or for individual tables. (ii) “Entire database backup” saves the entire database on backup media. ... the following description of a database, and then answer the Subquestions 1 through 3. Company M investigated relation schemas as part of its efforts to build a database for mana...

Ngày tải lên: 24/08/2012, 15:44

... received Shipment Shipment detail Order detail Direct shipment A B October, 2005 VITEC Database Systems Engineer Examination (Afternoon, Part 2) 1. Examination Time-14:30-16:30 (120 ... system Sales performance Masters Masters, sales performance, etc. Operations database Information system Analytical database - 5 - (Shipment scheduling) • Order information is...

Ngày tải lên: 24/08/2012, 15:44

Ngày tải lên: 24/09/2012, 10:40

Ngày tải lên: 24/09/2012, 11:48