Loose Leaf For Introduction To Computing Systems: From Bits & Gates To C & Beyond
3rd Edition
ISBN: 9781260424744
Author: Yale N. Patt, Sanjay Patel
Publisher: McGraw-Hill Education
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Chapter 3, Problem 9E
Program Plan Intro
Transistor
- A transistor is a semiconductor device for amplifying or switching electric signals and electric power.
- It is composed of semiconductor material with three terminals for connecting to the external circuit.
- A transistor can amplify a signal since the controlled or output power is higher than the controlling or input power.
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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.
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(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.
(a) Every faculty member must teach at least two courses.
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Chapter 3 Solutions
Loose Leaf For Introduction To Computing Systems: From Bits & Gates To C & Beyond
Ch. 3 - Prob. 1ECh. 3 - Replace the missing parts in the following circuit...Ch. 3 - A two-input AND and a two-input OR are both...Ch. 3 - Replace the missing parts in the following circuit...Ch. 3 - Complete a truth table for the transistor-level...Ch. 3 - For the transistor-level circuit in Figure 3.38,...Ch. 3 - Prob. 7ECh. 3 - The transistor-level circuit below implements the...Ch. 3 - What does the following transistor circuit do?
Ch. 3 - For what values of A, B, C, D, E, and F will the...
Ch. 3 - A student knew that an inverter contained one...Ch. 3 - The following logic diagram produces the logical...Ch. 3 - The following logic circuits consist of two...Ch. 3 - Fill in the truth table for the logical expression...Ch. 3 - Fill in the truth table for a two-input NOR...Ch. 3 - Prob. 19ECh. 3 - How many output lines will a 16-input multiplexer...Ch. 3 - Prob. 21ECh. 3 - Given the following truth table, generate the...Ch. 3 - Prob. 23ECh. 3 - Prob. 24ECh. 3 - Logic circuit 1 in Figure 3.39 has inputs A, B, C....Ch. 3 - You know a byte is eight bits. We call a four-bit...Ch. 3 - Prob. 28ECh. 3 - Prob. 29ECh. 3 - Say the speed of a logic structure depends on the...Ch. 3 - Recall that the adder was built with individual...Ch. 3 - For this question, refer to the figure that...Ch. 3 - Prob. 35ECh. 3 - A comparator circuit has two 1-bit inputs A and B...Ch. 3 - If a computer has eight-byte addressability and...Ch. 3 - Prob. 38ECh. 3 - Refer to Figure 3.21, the diagram of the...Ch. 3 - Given a memory that is addressed by 22 bits and is...Ch. 3 - Prob. 42ECh. 3 - Prob. 43ECh. 3 - Prob. 44ECh. 3 - Prob. 47ECh. 3 - Refer to Figure 3.32. Why are lights 1 and 2...Ch. 3 - Prob. 49ECh. 3 - We have learned that we can write one bit of...Ch. 3 - A student decided to design a latch as shown...
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