DATABASE SYSTEM CONCEPTS (LOOSELEAF)
7th Edition
ISBN: 9781260515046
Author: SILBERSCHATZ
Publisher: MCG
expand_more
expand_more
format_list_bulleted
Expert Solution & Answer
Chapter 16, Problem 5PE
Explanation of Solution
To estimate the size of the r1 |><| r2 |><| r3:
- The given relations are,
- r1(A,B,C)
- r2(C,D,E)
- r3(E,F)
- The above relations r1, r2, and r3 having the primary keys “A”, “C” and “E” respectively.
- In relational algebra, the associative and communicative properties are exhibited using joins.
- Hence, joining thee relations produce the same result.
- The required size is computed as follows,
- Perform the join of relation r1 with r2, and this result will contain 1000 records as “C” is the primary key or relation r2 and is common in two relations r1, and r2.
- Next, perform the join operation of relation r3 with the above result and this result will contain 1000 records as “E” is the primary key for the relation r3 and is common in two relations...
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
Need help answering these questions!1. Design a While loop that lets the user enter a number. The number should be multiplied by 10, and the result stored in a variable named product. The loop should iterate as long as the product contains a value less than 100.
2. Design a For loop that displays the following set of numbers: 0, 10, 20, 30, 40, 50 . . . 1000
3. Convert the While loop in the following code to a Do-While loop:
Declare Integer x = 1
While x > 0
Display "Enter a number."
Input x
End While
Need help with these:Design a While loop that lets the user enter a number. The number should be multiplied by 10, and the result stored in a variable named product. The loop should iterate as long as the product contains a value less than 100.
2. Design a For loop that displays the following set of numbers: 0, 10, 20, 30, 40, 50 . . . 1000
3. Convert the While loop in the following code to a Do-While loop:
Declare Integer x = 1
While x > 0
Display "Enter a number."
Input x
End While
Convert the While loop in the following code to a Do-While loop: Declare Integer x = 1 While x > 0 Display "Enter a number." Input x End While
Chapter 16 Solutions
DATABASE SYSTEM CONCEPTS (LOOSELEAF)
Ch. 16 - Prob. 2PECh. 16 - Prob. 3PECh. 16 - SQL allows relations with duplicates (Chapter 3),...Ch. 16 - Prob. 5PECh. 16 - Prob. 6PECh. 16 - Prob. 7PECh. 16 - Prob. 8PECh. 16 - Prob. 9PECh. 16 - Prob. 10PECh. 16 - Prob. 12PE
Ch. 16 - Prob. 13PECh. 16 - Prob. 14PECh. 16 - Prob. 16ECh. 16 - Prob. 17ECh. 16 - Prob. 19ECh. 16 - Explain how to use a histogram to estimate the...Ch. 16 - Prob. 21ECh. 16 - Prob. 22ECh. 16 - Describe how to incrementally maintain the results...Ch. 16 - Prob. 24ECh. 16 - Prob. 25ECh. 16 - Prob. 26ECh. 16 - Prob. 27E
Knowledge Booster
Similar questions
- Python - need help creating a python program that will sum the digits of a number entered by the user. For example if the user inputs the value 243 the program will output 9 because 2 + 4 + 3 = 9. The program should ask for a single integer from the user, it should then calculate the sum of all the digits of that number and output the result.arrow_forwardI need help with this in Python (with flowchart): Im creating a reverse guessing game. Then to choose a random number from 1 to 100 and the computer program will attempt to guess it, displaying the directions calculated or not. The guess will be displayed and the user will answer if it was correct or not. If correct, the game ends, if not then the computer asks if the guess was too high or too low. Finally inputting an answer and the computer generates a new guess within the proper range. Oh and to make sure the program doesnt guess outside of the ranges produced by the inputs of “too high” and “too low”. The program ending when the user guesses correctly or after the program takes 6 guesses. HELP ASAP!arrow_forwardI need help with this in Python (with flowchart): Im creating a reverse guessing game. Then to choose a random number from 1 to 100 and the computer program will attempt to guess it, displaying the directions calculated or not. The guess will be displayed and the user will answer if it was correct or not. If correct, the game ends, if not then the computer asks if the guess was too high or too low. Finally inputting an answer and the computer generates a new guess within the proper range. Oh and to make sure the program doesnt guess outside of the ranges produced by the inputs of “too high” and “too low”. The program ending when the user guesses correctly or after the program takes 6 guesses. HELP ASAP!arrow_forward
- Need help finding errors in my pseudocode (Two)! Declare Boolean finished = False Declare Integer value, cube While NOT finished Display "Enter a value to be cubed." Input value; Set cube = value^3 Display value, " cubed is ", cube End While Next, I intended the following pseudocode to display the numbers 1 through 60, and then display the message "Time’s up!". Doesnt work and has error. Declare Integer counter = 1 Const Integer TIME_LIMIT = 60 While counter < TIME_LIMIT Display counter Set counter = counter + 1 End While Display "Time's up!"arrow_forwardHaving error in pseudcode; wanting to get five sets of two numbers each, calculate the sum of each set, and calculate the sum of all the numbers entered. Not functioning as intended and can't find the error.Code: // This program calculates the sum of five sets of two numbers. Declare Integer number, sum, total Declare Integer sets, numbers Constant Integer MAX_SETS = 5 Constant Integer MAX_NUMBERS = 2 Set sum = 0; Set total = 0; For sets = 1 To MAX_NUMBERS For numbers = 1 To MAX_SETS Display "Enter number ", numbers, " of set ", sets, "." Input number; Set sum = sum + number End For Display "The sum of set ", sets, " is ", sum "." Set total = total + sum Set sum = 0 End For Display "The total of all the sets is ", total, "."arrow_forwardNeed help converting loops!1. Convert the following While loop to a For loop: Declare Integer count = 0 While count < 50 Display "The count is ", count Set count = count + 1 End While _________________________________________________ 2. Convert the following For loop to a While loop: Declare Integer count For count = 1 To 50 Display count End Forarrow_forward
- Need help making this!1.Design a nested loop that displays 10 rows of # characters. There should be 15 # characters in each row. 2. Design a nested set of for loops that displays the following arrangements of ‘X’ characters X XX XXX XXXX XXXXX XXXXXXarrow_forwardI need help to resolve the case, thank youarrow_forwardIn 32-bit MSAM, You were given the following negative array. write a program that converts each array element to its positive representation. Then add all these array elements and assign them to the dl register. .data myarr sbyte -5, -6, -7, -4.code ; Write the rest of the program and paste the fully working code in the space below. the dl register should have the value 22 after summing up all elements in the array.arrow_forward
- Microprocessor 8085 Lab Experiment Experiment No. 3 Logical Instructions Write programs with effects 1. B=(2Dh XOR D/2) - (E AND 2Eh+1) when E=53, D=1Dh 2. HL= (BC+HL) XOR DE (use register pair when necessary), when BC=247, HL 516, DE 12Ach 3. Reset bits 1,4,6 of A and set bits 3,5 when A=03BH Write all as table (address line.hexacode,opcede,operant.comment with flags)arrow_forwardIn 32-bit MASM, Assume your grocery store sells three types of fruits. Apples, Oranges, and Mangos. Following are the sale numbers for the week (7 days).dataapples dword 42, 47, 52, 63, 74, 34, 73oranges dword 78, 53, 86, 26, 46, 51, 60mangos dword 30, 39, 41, 70, 75, 84, 29Using a single LOOP instruction, write a program to add elements in all these three arrays. Then assign the total result into the eax register. The eax register should have the value 1153 after a successful execution.arrow_forwardYou were given the following negative array. write a program that converts each array element to its positive representation. Then add all these array elements and assign them to the dl register. .data myarr sbyte -5, -6, -7, -4.code ; Write the rest of the program and paste the fully working code in the space below. The dl register should have the value 22 after summing up all elements in the array. Your answer must be in 32-bit MSAM.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