A GUIDE TO SQL
9th Edition
ISBN: 9781305897397
Author: Pratt
Publisher: CENGAGE L
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Chapter 8, Problem 20RQ
Explanation of Solution
Trigger:
- The trigger is a named set of SQL statement that is executed at the time of data modification.
- If the stated trigger condition meets up, then it means that the mentioned action in the trigger has been performed.
Three parts of trigger:
- Event:
- It specifies the changes to be made, such as an UPDATE or DELETE of a record.
- Condition:
- It specifies the condition to examine the records about to be affected...
Explanation of Solution
Purpose of triggers:
The purpose of triggers is given below:
- For enforcement of business or security constraints.
- Creation of duplication tables for backup purposes.
- Used for auditing purpose.
- In shopping scenario, it is used to offer free shipping for a client who orders an item which is more than $1000. A trigger will be built to check the order total upon the completion of the order...
Expert Solution & Answer
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Students have asked these similar questions
1. Create a Book record that implements the Comparable interface, comparing the
Book objects by year
- title: String
>
- author: String
- year: int
Book
+ compareTo(other Book: Book): int
+ toString(): String
Submit your source code on Canvas (Copy
your code to text box or upload.java file)
>
Comparable
2. Create a main method in Book record.
1) In the main method, create an array of 2 objects of Book with your choice of
title, author, and year.
2) Sort the array by year
3) Print the object. Override the toString in Book to match the example output:
@Javadoc Declaration Console X Properties
Book [Java Application] /Users/kuan/.p2/pool/plugins/org.eclipse.justj.openjdk.hotspo
[Book: year=1901, Book: year=2010]
Q5-The efficiency of a 200 KVA, single phase transformer is 98% when operating at full load 0.8
lagging p.f. the iron losses in the transformer is 2000 watt. Calculate the i) Full load copper losses ii)
half load copper losses and efficiency at half load. Ans: 1265.306 watt, 97.186%
2. Consider the following pseudocode for partition:
function partition (A,L,R)
pivotkey = A [R]
t = L
for i
L to R-1 inclusive:
if A[i] A[i]
t = t + 1
end if
end for
A [t] A[R]
return t
end function
Suppose we call partition (A,0,5) on A=[10,1,9,2,8,5]. Show the state of the list at the
indicated instances.
Initial A
After i=0 ends
After 1 ends
After i 2 ends
After i = 3 ends
After i = 4 ends
After final swap
10 19 285
[12 pts]
Chapter 8 Solutions
A GUIDE TO SQL
Ch. 8 - Prob. 1RQCh. 8 - Prob. 2RQCh. 8 - Prob. 3RQCh. 8 - Prob. 4RQCh. 8 - Prob. 5RQCh. 8 - Prob. 6RQCh. 8 - Prob. 7RQCh. 8 - Prob. 8RQCh. 8 - Prob. 9RQCh. 8 - In PL/SQL, how do you assign variables the same...
Ch. 8 - Prob. 11RQCh. 8 - Prob. 12RQCh. 8 - Prob. 13RQCh. 8 - Prob. 14RQCh. 8 - Prob. 15RQCh. 8 - Prob. 16RQCh. 8 - Prob. 17RQCh. 8 - Prob. 18RQCh. 8 - Prob. 19RQCh. 8 - Prob. 20RQCh. 8 - Prob. 21RQCh. 8 - Prob. 22RQCh. 8 - Prob. 1TDCh. 8 - Prob. 2TDCh. 8 - Prob. 3TDCh. 8 - Prob. 4TDCh. 8 - Prob. 5TDCh. 8 - Prob. 6TDCh. 8 - Prob. 7TDCh. 8 - Prob. 8TDCh. 8 - Prob. 9TDCh. 8 - Prob. 10TDCh. 8 - Prob. 1CATCh. 8 - Prob. 2CATCh. 8 - Prob. 3CATCh. 8 - Prob. 4CATCh. 8 - Prob. 5CATCh. 8 - Prob. 6CATCh. 8 - Prob. 7CATCh. 8 - Prob. 9CATCh. 8 - Prob. 1SCGCh. 8 - Prob. 2SCGCh. 8 - Prob. 3SCGCh. 8 - Prob. 4SCGCh. 8 - Prob. 5SCGCh. 8 - Prob. 6SCGCh. 8 - Prob. 7SCGCh. 8 - SQL includes many numerical functions. Two of...
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