Pearson eText for Modern Database Management -- Instant Access (Pearson+)
13th Edition
ISBN: 9780137305940
Author: Jeffrey Hoffer, Ramesh Venkataraman
Publisher: PEARSON+
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Textbook Question
Chapter 5, Problem 5.17RQ
What is the difference between COUNT, COUNT DISTINCT, and COUNT(*) in SQL? When will these three commands generate the same and different results?
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This is a question that I have and would like someone who has experiences with scene graphs and entity component systems to answer.For context, I am currently implementing a game engine and currently I am debating on our current design.Our current design is we have a singular game component class that every component inherits from. Where we have components like SpriteRendererComponent, Mehs Component, etc. They inherit from this GameComponent class. The point of this is being able to have O(1) access to the scene to being able to modify components to attach more components with the idea of accessing those components to specific scene objects in a scene.Now, my question is what kinds of caveauts can this cause in terms of cache coherence? I am well aware that yes its O(1) and that is great but cache coherence is going to be really bad, but would like to know more explicit details and real-life examples such as write in RAM examples on how this is bad. A follow-up question that is part…
Q4: Consider the following MAILORDER relational schema describing the data for a mail order
company. (Choose five only).
PARTS(Pno, Pname, Qoh, Price, Olevel)
CUSTOMERS(Cno, Cname, Street, Zip, Phone)
EMPLOYEES(Eno, Ename, Zip, Hdate)
ZIP CODES(Zip, City)
ORDERS(Ono, Cno, Eno, Received, Shipped)
ODETAILS(Ono, Pno, Qty)
(10 Marks)
I want a detailed explanation to
understand the mechanism how it is
Qoh stands for quantity on hand: the other attribute names are self-explanatory. Specify and
execute the following queries using the RA interpreter on the MAILORDER database schema.
a. Retrieve the names of parts that cost less than $20.00.
b. Retrieve the names and cities of employees who have taken orders for parts costing more than
$50.00.
c. Retrieve the pairs of customer number values of customers who live in the same ZIP Code.
d. Retrieve the names of customers who have ordered parts from employees living in Wichita.
e. Retrieve the names of customers who have ordered parts costing less…
Q4: Consider the following MAILORDER relational schema describing the data for a mail order
company. (Choose five only).
(10 Marks)
PARTS(Pno, Pname, Qoh, Price, Olevel)
CUSTOMERS(Cno, Cname, Street, Zip, Phone)
EMPLOYEES(Eno, Ename, Zip, Hdate)
ZIP CODES(Zip, City)
ORDERS(Ono, Cno, Eno, Received, Shipped)
ODETAILS(Ono, Pno, Qty)
Qoh stands for quantity on hand: the other attribute names are self-explanatory. Specify and
execute the following queries using the RA interpreter on the MAILORDER database schema.
a. Retrieve the names of parts that cost less than $20.00.
b. Retrieve the names and cities of employees who have taken orders for parts costing more than
$50.00.
c. Retrieve the pairs of customer number values of customers who live in the same ZIP Code.
d. Retrieve the names of customers who have ordered parts from employees living in Wichita.
e. Retrieve the names of customers who have ordered parts costing less than$20.00.
f. Retrieve the names of customers who have not placed…
Chapter 5 Solutions
Pearson eText for Modern Database Management -- Instant Access (Pearson+)
Ch. 5 - Define each of the following terms: data...Ch. 5 - Match the following terms to the appropriate...Ch. 5 - Prob. 5.3RQCh. 5 - Prob. 5.4RQCh. 5 - Prob. 5.5RQCh. 5 - Prob. 5.6RQCh. 5 - List six potential benefits of achieving an SQL...Ch. 5 - Prob. 5.8RQCh. 5 - Distinguish among data definition commands, data...Ch. 5 - Prob. 5.10RQ
Ch. 5 - Prob. 5.11RQCh. 5 - Explain the purpose of indexing in database...Ch. 5 - What are the potential consequence of...Ch. 5 - Prob. 5.14RQCh. 5 - Explain and provide at least one example Of how to...Ch. 5 - Prob. 5.16RQCh. 5 - What is the difference between COUNT, COUNT...Ch. 5 - What is the evaluation order for the Boolean...Ch. 5 - If an SQL statement includes a GROUP BY clause,...Ch. 5 - Prob. 5.20RQCh. 5 - Prob. 5.21RQCh. 5 - Prob. 5.22RQCh. 5 - Explain why SQL is called a set-oriented language.Ch. 5 - When would the use of the LIKE key word with the...Ch. 5 - Prob. 5.25RQCh. 5 - Prob. 5.26RQCh. 5 - In what order are the clauses of an SQL statement...Ch. 5 - Within which clauses of an SQL statement can a...Ch. 5 - Prob. 5.29RQCh. 5 - Prob. 5.30RQCh. 5 - Prob. 5.31RQCh. 5 - Explain the difference between the WHERE and...Ch. 5 - Prob. 5.33RQCh. 5 - Write a database description for each of the...Ch. 5 - Analyze the database to determine whether or not...Ch. 5 - Prob. 5.36PAECh. 5 - To enforce referential integrity, before any row...Ch. 5 - Write SQL data definition commands for each of the...Ch. 5 - Write SQL commands for the following: Create two...Ch. 5 - Write SQL queries to answer the following...Ch. 5 - Write SQL queries to answer the following...Ch. 5 - Write SQL queries to answer the following...Ch. 5 - Write SQL queries to answer the following...Ch. 5 - Prob. 5.44PAECh. 5 - Prob. 5.45PAECh. 5 - Prob. 5.46PAECh. 5 - What is the average Read score for all students?...Ch. 5 - Prob. 5.48PAECh. 5 - What are the TutorIDs for tutors who have not yet...Ch. 5 - Prob. 5.50PAECh. 5 - Prob. 5.51PAECh. 5 - Prob. 5.52PAECh. 5 - Prob. 5.53PAECh. 5 - Prob. 5.54PAECh. 5 - How many tutors have an Active status in the...Ch. 5 - Prob. 5.56PAECh. 5 - Modify the Product_T table by adding an attribute...Ch. 5 - Enter sample data of your own choosing into...Ch. 5 - Add an order to the Order_T table and include a...Ch. 5 - Use the Pine Valley database to answer the...Ch. 5 - Prob. 5.61PAECh. 5 - Prob. 5.62PAECh. 5 - Prob. 5.63PAECh. 5 - Prob. 5.64PAECh. 5 - Prob. 5.65PAECh. 5 - Prob. 5.66PAECh. 5 - Prob. 5.67PAECh. 5 - Modify query in P&E 5-67 by considering only those...Ch. 5 - Prob. 5.69PAECh. 5 - Prob. 5.70PAECh. 5 - Prob. 5.71PAECh. 5 - Prob. 5.72PAECh. 5 - Prob. 5.73PAECh. 5 - Prob. 5.74PAECh. 5 - Prob. 5.75PAECh. 5 - Prob. 5.76PAECh. 5 - Prob. 5.77PAECh. 5 - Assume that for those materials the ID of which...Ch. 5 - Prob. 5.79PAECh. 5 - Prob. 5.80PAECh. 5 - Prob. 5.81PAECh. 5 - Prob. 5.82PAECh. 5 - Prob. 5.83PAECh. 5 - Prob. 5.84PAECh. 5 - Prob. 5.85PAECh. 5 - Prob. 5.86PAECh. 5 - Prob. 5.87PAECh. 5 - Prob. 5.88PAECh. 5 - Prob. 5.89PAECh. 5 - Prob. 5.90PAECh. 5 - Prob. 5.91PAECh. 5 - Prob. 5.92PAECh. 5 - Prob. 5.93PAE
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