EBK DATABASE SYSTEM CONCEPTS
7th Edition
ISBN: 9781260049268
Author: SILBERSCHATZ
Publisher: MCG COURSE
expand_more
expand_more
format_list_bulleted
Expert Solution & Answer
Chapter 15, Problem 21E
Explanation of Solution
Extending the hash-join
- The hash-join is used to compute the natural join of two relations.
- The hash-join algorithm can be extended to compute the natural left outer join by,
- Padding the tuple tr in the probe relation with nulls, if no matching tuple is found in the build relation’s hash partition.
- Include this null padded tuple in the result as well.
- The hash-join algorithm can be extended to compute the natural right outer join by,
- Keeping a Boolean flag with each tuple in the current build relation partition which resides in memory.
- Set it whenever any probe relation tuple matches the above tuple.
- Finally, Pad with null those tuples which do not have their flags set and include them in the result.
- The hash-join algorithm can be extended to compute the natural full outer join by performing natural left outer join and natural right outer join together.
Example:
Consider the customer and depositor relations given below:
| customer_name | customer_address | customer_city |
| Adam | Park Street | Brooklyn |
| Eve | Main Road | Rye |
| John | Bell Cross | Harrison |
| Jane | Sand Hill | Woodside |
| Tom | Walnut | Pittsfield |
| Jerry | Alma | Alabama |
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
How can I resolve the following issue?
I need help to resolve, thank you.
Let the user choose encryption or decryption.
For encryption, let user input the key in Hexadecimal number, the plain text in Hexadecimal number, output the ciphertext (in hexadecimal numbers).
For decryption, let user input the key in Hexadecimal number, the ciphertext (in hexadecimal numbers), output the decrypted message (Hexadecimal number).
Both encryption and decryption should output the different operation results for each round like the following:
For example:
Round 1:
E(R0) = ...... (Hex or Binary)
K1 = ……
E(Ro) xor K1 =
S-box outputs = ……
f(Ro1, K1) = …..
L2 =R1 =…….
La = Ra
Round 2:
.....•
No Encryption/Decryption libraries or functions provided by the third party are allowed.
Submit your program codes to Moodle with the notes of how to compile and run your program.
Chapter 15 Solutions
EBK DATABASE SYSTEM CONCEPTS
Knowledge Booster
Similar questions
- When the given integer variable numberOfPackages is: greater than 12, output "Needs more than one box". between 5 inclusive and 12 inclusive, output "Large box". between 0 exclusive and 4 inclusive, output "Small box". less than or equal to 0, output "Invalid input". End with a newline.arrow_forwardsummarize in a short paragraph how to Advance Incident Response and Automation in ML home based security systemsarrow_forward1.[30 pts] Computers generate color pictures on a video screen or liquid crystal display by mixing three different colors of light: red, green, and blue. Imagine a simple scheme, with three different lights, each of which can be turned on or off, projecting onto a glass screen: We can create eight different colors based on the absence (0) or presence (1) of light sources R,G and B: R G B Color 0 0 0 Black 0 0 1 Blue 0 1 0 Green 0 1 1 Cyan 1 0 0 Red 1 0 1 Magenta 1 1 1 0 Yellow 1 White 1 Each of these colors can be represented as a bit vector of length 3, and we can apply Boolean operations to them. a. The complement of a color is formed by turning off the lights that are on and turning on the lights that are off. What would be the complement of each of the eight colors listed above? b. Describe the effect of applying Boolean operations on the following colors: Λ 1. Red(100) ^ Magenta(101)= Blue(001) 2. Bue(001) | Green(010)= 3. Yellow(100) & Cyan(011)= 2.[30 pts] Perform the following…arrow_forward
- D. S. Malik, Data Structures Using C++, 2nd Edition, 2010arrow_forwardMethods (Ch6) - Review 1. (The MyRoot method) Below is a manual implementation of the Math.sqrt() method in Java. There are two methods, method #1 which calculates the square root for positive integers, and method #2, which calculates the square root of positive doubles (also works for integers). public class SquareRoot { public static void main(String[] args) { } // implement a loop of your choice here // Method that calculates the square root of integer variables public static double myRoot(int number) { double root; root=number/2; double root old; do { root old root; root (root_old+number/root_old)/2; } while (Math.abs(root_old-root)>1.8E-6); return root; } // Method that calculates the square root of double variables public static double myRoot(double number) { double root; root number/2; double root_old; do { root old root; root (root_old+number/root_old)/2; while (Math.abs (root_old-root)>1.0E-6); return root; } } Program-it-Yourself: In the main method, create a program that…arrow_forwardI would like to know the main features about the following 3 key concepts:1. Backup Domain Controller (BDC)2. Access Control List (ACL)3. Dynamic Memoryarrow_forward
- In cell C21, enter a formula to calculate the number of miles you expect to drive each month. Divide the value of number of miles (cell A5 from the Data sheet) by the average MPG for the vehicle multiplied by the price of a gallon of gas (cell A6 from the Data sheet).arrow_forwardMicrosoft Excelarrow_forwardIn cell C16, enter a formula to calculate the price of the vehicle minus your available cash (from cell A3 in the Data worksheet). Use absolute references where appropriate—you will be copying this formula across the row what fomula would i use and how do i solve itarrow_forward
- What types of data visualizations or tools based on data visualizations have you used professionally, whether in a current or past position? What types of data did they involve? What, in your experience, is the value these data views or tools added to your performance or productivity?arrow_forwardQuestion: Finding the smallest element and its row index and column index in 2D Array: 1. Write a public Java class min2D. 2. In min2D, write a main method. 3. In the main method, create a 2-D array myArray with 2 rows and 5 columns: {{10, 21, 20, 13, 1}, {2, 6, 7, 8, 14}}. 4. Then, use a nested for loop to find the smallest element and its row index and column index. 5. Print the smallest element and its row index and column index on Java Consolearrow_forward(using R)The iris data set in R gives the measurements in centimeters of the variables sepal length and width andpetal length and width, respectively, for 50 flowers from each of 3 species of iris, setosa, versicolor, andvirginica. Use the iris data set and the t.test function, test if the mean of pepal length of iris flowers isgreater than the mean of sepal length.The iris data set in R gives the measurements in centimeters of the variables sepal length and width andpetal length and width, respectively, for 50 flowers from each of 3 species of iris, setosa, versicolor, andvirginica. Use the iris data set and the t.test function, test if the mean of pepal length of iris flowers isgreater than the mean of sepal length.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Database System ConceptsComputer ScienceISBN:9780078022159Author:Abraham Silberschatz Professor, Henry F. Korth, S. SudarshanPublisher:McGraw-Hill Education
Starting Out with Python (4th Edition)Computer ScienceISBN:9780134444321Author:Tony GaddisPublisher:PEARSON
Digital Fundamentals (11th Edition)Computer ScienceISBN:9780132737968Author:Thomas L. FloydPublisher:PEARSON
C How to Program (8th Edition)Computer ScienceISBN:9780133976892Author:Paul J. Deitel, Harvey DeitelPublisher:PEARSON
Database Systems: Design, Implementation, & Manag...Computer ScienceISBN:9781337627900Author:Carlos Coronel, Steven MorrisPublisher:Cengage Learning
Programmable Logic ControllersComputer ScienceISBN:9780073373843Author:Frank D. PetruzellaPublisher:McGraw-Hill Education
Database System Concepts
Computer Science
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:McGraw-Hill Education
Starting Out with Python (4th Edition)
Computer Science
ISBN:9780134444321
Author:Tony Gaddis
Publisher:PEARSON
Digital Fundamentals (11th Edition)
Computer Science
ISBN:9780132737968
Author:Thomas L. Floyd
Publisher:PEARSON
C How to Program (8th Edition)
Computer Science
ISBN:9780133976892
Author:Paul J. Deitel, Harvey Deitel
Publisher:PEARSON
Database Systems: Design, Implementation, & Manag...
Computer Science
ISBN:9781337627900
Author:Carlos Coronel, Steven Morris
Publisher:Cengage Learning
Programmable Logic Controllers
Computer Science
ISBN:9780073373843
Author:Frank D. Petruzella
Publisher:McGraw-Hill Education