EBK CONCEPTS OF DATABASE MANAGEMENT
EBK CONCEPTS OF DATABASE MANAGEMENT
9th Edition
ISBN: 9781337670494
Author: Last
Publisher: Cengage Learning
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Chapter 4, Problem 1RQ
To determine

To explain a view, its definition and what happens when user accesses a database through a view.

Expert Solution & Answer
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Explanation of Solution

A view is an individual user’s or application program’s picture of a database. View is used by an individual to create charts, reports and other objects with the help of data in database.

The SELECT command used in the View creation basically creates the view and gives the definition for the view. It indicates what to include in a view. The data described in a view definition never exists in that form. In fact, when a query is created with a view, the DBMS make changes to the query and make it to the one that includes the data selection from the tables that created the view. There is less involvement of view than the full database.

Accessing a database through a view, the users cannot make any changes to the structure of the database and can only view the data.

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EXPLORER OPEN EDITORS Welcome com.py... Welcome xcom.py 2 ✓ DB com.py com.sql 6 8 9 10 11 12 13 14 15 16 17 com.py db class Rectangle: def _init_(self, length, width): self.length-length self.width-width def area(self): return self.width *self.length def perimeter(self): return 2+self.width*self.length y=Rectangle(5,1) print(y.area) Why does an error appear in the code print(y.perimeter) PROBLEMS OUTPUT TERMINAL DEBUG CONSOLE PORTS I > OUTLINE > TIMELINE 0A4 0 self.width *self.length AAAA NameError: name 'self' is not defined PS C:\Users\hp\Desktop\db> & C:/Users/hp/AppData/Local/Microsoft/WindowsApps/python3.12.exe c:/Users/hp/Desktop/db/com.py Traceback (most recent call last): File "c:\Users\hp\Desktop\db\com.py", line 1, in class Rectangle: File "c:\Users\hp\Desktop\db\com.py", line 7, in Rectangle self.width *self.length ^^^^^ NameError: name 'self' is not defined PS C:\Users\hp\Desktop\db> Ln 17, Col 1 Spaces: 4 UTF-8 CRLF (Python 3 A ENG
Refer to page 30 for problems on image edge detection. Instructions: Implement an edge detection algorithm (e.g., Sobel or Canny) for the given image. • Explain the preprocessing steps (grayscale conversion, noise reduction) and calculate gradient intensities. • Visualize and compare the results with manual edge annotations. Link: [https://drive.google.com/file/d/1wKSrun-GlxirS31Z9qoHazb9tC440 AZ F/view?usp=sharing]
Refer to page 100 for problems on 2D and 3D transformations. Instructions: Compute the result of applying a sequence of transformations (e.g., translation, rotation, scaling) to a given shape. Use homogeneous coordinates for matrix representation. • Show all intermediate matrices and verify the final position of the shape. Link: [https://drive.google.com/file/d/1wKSrun-GlxirS3IZ9qoHazb9tC440 AZF/view?usp=sharing]
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