viewquestions/12477/ Explain the problems that can occur when concurrent transaction are executed give examples Database Management Systems 10CS54 VTU notes JULY 2013 Jan 2014July 2015

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


Discuss the significance of assertion? Database Management Systems - 10CS54 VTU notes (DEC/JAN 2013/ JAN- 2014)

Write an assertion to specify constraint such that the salary of an employee must not be greater than the salary of the manager of the department that employees works for?


By:anonymousguy7799

Taged users:


Likes:
Be first to like this question

Dislikes:
Be first to dislike this question

Talk about thisDelete|Like|Dislike|

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.



Answers

CREATE ASSERTION SALARY_CONSTRAINTCHECK (NOT EXISTS (SELECT *FROM EMPLOYEE E, EMPLOYEE M, DEPARTMENT DWHERE E.SALARY > M.SALARY ANDE.DNO=D.NUMBER AND D.MGRSSN=M.SSN))
An assertion is a piece of SQL which makes sure a condition is satisfied or it stops action being taken on a database object. It could mean locking out the whole table or even the whole database. 
To make matters more confusing - a trigger could be used to enforce a check constraint and in some DBs can take the place of an assertion (by allowing you to run code un-related to the table being modified). 
A common mistake for beginners is to use a check constraint when a trigger is required or a trigger when a check constraint is required.

Nikhil-bharadwaj

Likes:
Be first to like this answer

Dislikes:
Be first to dislike this answer
Talk about this|Once you have earned teacher badge you can edit this questionDelete|Like|Dislike|
------------------------------------


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

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



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

Join eduladder!