How is a view created and dropped Database Management Systems 10CS54 VTU notes Dec 11Jan 126 marks Dec 14Jan 15

The Eduladder is a community of students, teachers, and programmers just interested to make you pass any exams. So we solve previous year question papers for you.
See Our team
Wondering how we keep quality?
Got unsolved questions?

Ask Questions

Database-Management-Systems---10CS54-VTU-notes-->View question

How is a view created and dropped? Database Management Systems - 10CS54 VTU notes (Dec 11/Jan 12)(6 marks Dec 14/Jan 15)

What problems are associated with updating of views?


Asked by:anonymousguy7799

Taged users:


Likes:
Be first to like this question

Dislikes:
Be first to dislike this question
Talk about this  Delete  Like  Dislike

Answers
A view refers to a single table that is derived from other tables
 CREATE VIEW WORKS_ON1 AS SELECT FNAME, LNAME, PNAME, HOURS FROM EMPLOYEE, PROJECT, WORKS_ON WHERE SSN=ESSN AND PNO=PNUMBER A view can be dropped as shown below DROP VIEW WORKS_ON1.
Updating of Views: 
Updating the views can be complicated and ambiguous In general, an update on a view on defined on a single table w/o any aggregate functions can be mapped to an update on the base table A view with a single defining table is updatable if we view contain PK or CK of the base table View on multiple tables using joins are not updatable View defined using grouping/aggregate are not updatable 


Answerd By:Nikhil-bharadwaj

Likes:
Be first to like this answer

Dislikes:
Be first to dislike this answer
Talk about this  Delete  Like  Dislike

Can you help us to add better answer here? Please see this



You may also like our videos

Below are some of the videos from our collection. We saw that students not only needed content but also videos. So, we decided to build a video platform for you also an algorithm which shows best videos suites to you related to the content you are browsing check out some videos which suit best for you.

Lets together make the web is a better place

We made eduladder by keeping the ideology of building a supermarket of all the educational material available under one roof. We are doing it with the help of individual contributors like you, interns and employees. So the resources you are looking for can be easily available and accessible also with the freedom of remix reuse and reshare our content under the terms of creative commons license with attribution required close.

You can also contribute to our vision of "Helping student to pass any exams" with these.
Answer a question: You can answer the questions not yet answered in eduladder.
Career: Work or do your internship with us.
Create a video: You can teach anything and everything each video should be less than five minutes should cover the idea less than five min.
Donate: Ad revenue alone is not able to take care of our server cost consider donating at least a dollar Click here to donate.

If you want the help of doing any of these never hesitate to drop an email to me arunwebber[at]gmail[dot]com, Or you can ping us on WhatsApp ph: 8147433408


Not the answer you're looking for? Browse other questions from this Question paper or ask your own question.

Want to exlplore yourself?