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Graduate students have one major department in which they are working on their degree Each graduate student has another, more senior graduate student (known as a student advisor) who advises him or her on what courses to take Design and draw an ER diagram that captures the information about the university Use only the basic ER model here, that is, entities, relationships, and attributes Be sure to indicate any key and participation constraints Exercise 24 A company database needs to store information about employees (identi ed by ssn, with salary and phone as attributes); departments (identi ed by dno, with dname and budget as attributes); and children of employees (with name and age as attributes) Employees work in departments; each department is managed by an employee; a child must be identi ed uniquely by name when the parent (who is an employee; assume that only one parent works for the company) is known We are not interested in information about a child once the parent leaves the company Draw an ER diagram that captures this information Exercise 25 Notown Records has decided to store information about musicians who perform on its albums (as well as other company data) in a database The company has wisely chosen to hire you as a database designer (at your usual consulting fee of $2,500/day) Each musician that records at Notown has an SSN, a name, an address, and a phone number Poorly paid musicians often share the same address, and no address has more than one phone Each instrument that is used in songs recorded at Notown has a name (eg, guitar, synthesizer, ute) and a musical key (eg, C, B- at, E- at) Each album that is recorded on the Notown label has a title, a copyright date, a format (eg, CD or MC), and an album identi er Each song recorded at Notown has a title and an author Each musician may play several instruments, and a given instrument may be played by several musicians Each album has a number of songs on it, but no song may appear on more than one album Each song is performed by one or more musicians, and a musician may perform a number of songs Each album has exactly one musician who acts as its producer A musician may produce several albums, of course Design a conceptual schema for Notown and draw an ER diagram for your schema The following information describes the situation that the Notown database must model Be sure to indicate all key and cardinality constraints and any assumptions that you make Identify any constraints that you are unable to capture in the ER diagram and brie y explain why you could not express them.

Nested if statements are hard to read, hard to get right, and hard to debug. When you have a complex set of choices to make, the switch statement is a more powerful alternative. The logic of a switch statement is this: pick a matching value and act accordingly.

Sec 10-4

switch (expression) { case constant-expression: statement jump-statement [default: statement] }

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10-4-1 User Dynamics The change of users needs over time is illustrated in Example 10-8 using a case of current interest, analysis of energy problems The example demonstrates how user needs will shift over time in a single application Other, parallel applications will show di ering patterns at di ering time frames It may be impossible to build single systems that will satisfy the full range of requirements It is desirable, however, to be able to specify at a conceptual level which choices were made in the design and implementation of the informationretrieval system The de nition of choices at a high architectural level will considerably simplify the lower-level implementation decisions regarding le system support processes, update capability, and cost versus performance trade-o s

The expression you are testing (or switching on ) is put in parentheses in the head of the switch statement. Each case statement compares a constant value with the expression. The constant expression can be a literal, symbolic, or enumerated constant. The compiler starts with the first case statement and works its way down the list, looking for a value that matches the expression. If a case is matched, the statement (or block of statements) associated with that case is executed. The case block must end with a jump statement. Typically, the jump statement is break, which abruptly ends the entire switch statement. When you execute a break in a switch statement, execution continues after the closing brace of the switch statement. (We ll consider the use of the optional default keyword later in this section.) In the next, somewhat whimsical listing (Example 5-8), the user is asked to choose her political affiliation among Democrat, Republican, or Progressive. To keep the code simple, we ll hard-wire the choice to be Democrat.

10-4-2 System Dynamics By de nition one speci c data value can provide information to a user only once, unless the user has forgotten data received earlier An information-retrieval system hence remains valuable only if there is continuing change in data contents, dataanalysis capability, or users In order to operate an adequate information-retrieval system, the adequacy of the output in terms of providing useful information has to be monitored, and a mechanism has to be established to enhance both data organization and content as required Utilization statistics are one measure of database usage Attributes which are frequently accessed can be provided with indexes to increase access speeds Relationships which are frequently investigated can be bound as stored relations or can be materialized through pointer connections Users who interact with the database system will adapt faster to the system than the systems will adapt to them, and hence exclusive reliance on utilization statistics is not adequate

using using using using System; System.Collections.Generic; System.Linq; System.Text;

namespace Example_5_8_ _ _ _The_switch_Statement { class Program { enum Party { Democrat,

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