SURVEY OF OPERATING SYSTEMS
6th Edition
ISBN: 9781260096002
Author: Holcombe
Publisher: RENT MCG
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Chapter 8, Problem 15MCQ
When in the terminal window, which command would return you to your Home directory, no matter what directory is current?
- a. cd ..
- b. cd ~
- c. cd /
- d. chmod ~
- e. cd.
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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.
Chapter 8 Solutions
SURVEY OF OPERATING SYSTEMS
Ch. 8 - To access the CLI in the GNOME GUI, you open a...Ch. 8 - Prob. 2KTQCh. 8 - Prob. 3KTQCh. 8 - Prob. 4KTQCh. 8 - Prob. 5KTQCh. 8 - Prob. 6KTQCh. 8 - Prob. 7KTQCh. 8 - Prob. 8KTQCh. 8 - Prob. 9KTQCh. 8 - Prob. 10KTQ
Ch. 8 - Linux is modeled on which operating system? a....Ch. 8 - Prob. 2MCQCh. 8 - Who was the initial developer responsible for...Ch. 8 - Prob. 4MCQCh. 8 - Prob. 5MCQCh. 8 - Prob. 6MCQCh. 8 - What option for the ls command lists all files in...Ch. 8 - Prob. 8MCQCh. 8 - Prob. 9MCQCh. 8 - What organization formed in 1988 to lobby for an...Ch. 8 - Which command displays a text file one page...Ch. 8 - What command can you use at the CLI to temporarily...Ch. 8 - Which Linux command can you use to change file...Ch. 8 - Prob. 14MCQCh. 8 - When in the terminal window, which command would...Ch. 8 - Prob. 1EQCh. 8 - Prob. 2EQCh. 8 - Prob. 3EQCh. 8 - Prob. 4EQCh. 8 - Prob. 5EQ
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