DATABASE SYSTEM CONCEPTS LCPO
DATABASE SYSTEM CONCEPTS LCPO
7th Edition
ISBN: 9781265586577
Author: SILBERSCHATZ
Publisher: MCG
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Chapter 15, Problem 10PE

Explanation of Solution

a.

Semi-join operation:

  • Consider the two given relation “r” and “s”. To perform semi-join operation between the two relations using sorting:
  • Initially, sort the relation “r” on the join attributes in predicate θ.
  • Then sort relation “s” on the join attributes in predicate θ.
  • Like merge algorithm, scan the relation “r” and “s”.
  • Check whether the join attributes of current records of relation “r” and “s” is match.
    • Add records of relation “r” to the result...

Explanation of Solution

b.

Anti-semi-join operation:

  • To perform anti-semi-join operation between the two relation using sorting;
  • Initially, sort relation “r” on the join attributes in predicate θ.
  • Next, sort relation “s” on the join attributes in predicate θ.
  • Like merge algorithm, scan the relation “r” and “s”.
  • Check if no record of relation “s” gratifies the join predicate for the corresponding record in “r”...

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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
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