EBK USING MIS
10th Edition
ISBN: 9780134658919
Author: KROENKE
Publisher: YUZU
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Expert Solution & Answer
Chapter 6.7, Problem 3QLQ
Explanation of Solution
ASCII characters:
In a computer system, characters can be represented using standard numeric codes. The most commonly used standard is referred as “American Standard Code for Information Interchange (ASCII)”.
- ASCII is primarily based on the English alphabet for character encoding.
- It uses 128 unique characters; and seven bits to represent each character in the set. Check bit is used as the eighth bit to ensure proper data transmission.
- Extended ASCII character version includes the eighth bit and allows 256 unique characters, which includes some additional symbols and some accented letters.
- ASCII has a finite number of characters; so it lists them all and assigns binary string value to each one of them.
- However, some problems need to be addressed, such as, in English language, there are 26 letters, and ASCII considers uppercase, lowercase letters separately, and assigns a value for each of the 52 characters.
- ASCII character set as well as Unicode character set treats uppercase and lowercase letters distinctly.
Binary code:
The digital data can be symbolized, stored and communicated as a set of binary bits. This set is referred as binary code.
- The letters, special characters or digits are represented using the binary digits “0” and “1” in a computer device or other electronic devices...
Expert Solution & Answer
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Consider the following database for some store:
Customers (cid, cname, city, discount)Agents (aid, aname, city, percent)Products (pid, pname, city, quantity, price)Orders (ordno, mon, cid, aid, pid, qty, dollars)
The relation Customers records the ID (cid), name (cname), location (city) of each customer and a discount percentage (discount) for this customer.
The relation Agents records the ID (aid), name (aname), location (city) of each agent and a transaction fee (percent) charged by this agent.
The relation Products lists the ID (pid), name (pname), location (city), quantity and price of available products.
And finally, the relation Orders contains a unique order number (ordno), the month (mon), customer (cid), agent (aid), product (pid), quantity (qty) of each order as well as the total value (dollars) of the transaction.
1. Express the following query in SQL
(a) List customers (names) who do not have discounts but purchased at least one product of price greater than $50.
(b) Find…
Consider the following relational schema and briefly answer the questions that follow:
Emp(eid: integer, ename: string, age: integer, salary: real)
Works(eid: integer, did: integer, pct_time: integer)
Dept(did: integer, budget: real, managerid: integer)
a. Define a table constraint on Dept that will ensure that all managers have age > 30.
b. Write SQL statements to delete all information about employees whose salaries exceed that of the manager of one or more departments that they work in. Be sure to ensure that all the relevant integrity constraints are satisfied after your updates.
Consider the following relations:
Student(snum: integer, sname: string, rmajor: string,
level: string, age: integer)
Class(cname: string, meets_at: time, room: string, fid: integer)
Enrolled(snum: integer, cname: string)
Faculty(fid: integer, fname: string, deptid: integer)
The meaning of these relations is straightforward; for example, Enrolled has one record per student-class pair such that the student is enrolled in the class.
2. Express each of the following integrity constraints in SQL unless it is implied by the primary and foreign key constraint; if so, explain how it is implied. If the constraint cannot be expressed in SQL, say so. For each constraint, state what operations (inserts, deletes, and updates on specific relations) must be monitored to enforce the constraint.
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Chapter 6 Solutions
EBK USING MIS
Ch. 6.3 - Prob. 1EGDQCh. 6.3 - Prob. 2EGDQCh. 6.3 - Prob. 3EGDQCh. 6.3 - Prob. 4EGDQCh. 6.3 - Prob. 5EGDQCh. 6.3 - Prob. 6EGDQCh. 6.3 - Prob. 7EGDQCh. 6.3 - Prob. 8EGDQCh. 6.3 - Prob. 9EGDQCh. 6.7 - Prob. 1QLQ
Ch. 6.7 - Prob. 2QLQCh. 6.7 - Prob. 3QLQCh. 6.7 - The article mentions that quantum computers will...Ch. 6.8 - Prob. 1SGDQCh. 6.8 - Prob. 2SGDQCh. 6.8 - Prob. 3SGDQCh. 6.8 - Prob. 4SGDQCh. 6.8 - Prob. 5SGDQCh. 6.8 - Prob. 6.1ARQCh. 6.8 - Prob. 6.2ARQCh. 6.8 - Prob. 6.3ARQCh. 6.8 - Prob. 6.4ARQCh. 6.8 - Prob. 6.5ARQCh. 6.8 - Prob. 6.6ARQCh. 6.8 - Prob. 6.7ARQCh. 6.8 - Prob. 6.8ARQCh. 6 - Prob. 6.1UYKCh. 6 - Prob. 6.2UYKCh. 6 - Prob. 6.3UYKCh. 6 - Prob. 6.4UYKCh. 6 - Prob. 6.5UYKCh. 6 - Prob. 6.6UYKCh. 6 - Prob. 6.7CE6Ch. 6 - Prob. 6.8CE6Ch. 6 - Prob. 6.9CE6Ch. 6 - Prob. 6.1CE6Ch. 6 - Prob. 6.11CE6Ch. 6 - Prob. 6.12CE6Ch. 6 - Prob. 6.14CS6Ch. 6 - Prob. 6.15CS6Ch. 6 - Prob. 6.16CS6Ch. 6 - Prob. 6.17CS6Ch. 6 - Prob. 6.18CS6Ch. 6 - Prob. 6.19CS6Ch. 6 - Prob. 6.2CS6Ch. 6 - Prob. 6.21MMLCh. 6 - Prob. 6.22MML
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