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| 102. | Which of the following is true of a network structure? |
| a. | It is a physical representation of the data |
| b. | It allows a many-to-many relationship |
| c. | It is conceptually simple |
| d. | It will be the dominant data base of the future |
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- 124. The process of converting the requests into results between three-schema architecture internal, external and conceptual levels is called a. mapping b. pitching c. transforming d. dependenceConsider the following relations for a company database:• emp (ename, dname, salary)• mgr (ename, mname)and the Java code in Figure 5.20, which uses the JDBC API. Assume that the userid, password, machine name, etc. are all okay. Describe in concise English what the Java program does. (That is, produce an English sentence like “It finds v the manager of the toy department,” not a line-by-line description of what each Java statement does.)Create a sample XML document that implements the conceptual data model expressed in UML and shown below. Invent 5-10 instances that allow you to demonstrate the structure. Create an appropriate internal DTD. This is a specific set of instances -- you can come up them as you see fit. Be sure to view the XML to ensure it validates. Use <log> as the name of the "root" element of the XML document. pid, tid, and vid are primary key attributes in each of the entities. You need to add appropriate "links" so that the pages visits are linked to the appropriate page and visitor -- use the patterns to decide on an approach. There are multiple ways to solve this.
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