Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Consider the two relations given below
Given that A is the primary key of R, D is the primary key of S and there is a referential integrity among S.A and R.A, discuss all integrity constraints which are violated.
(i) Primary key of R contains the ‘null' value and the value ‘a1' is duplicated, therefore it violates the entity integrity constraint within the relation R.
(ii) In primary key of S, the value ‘d1' is duplicated; therefore it violates the entity integrity constraint within the relation S.
(iii) The foreign key S.A contains the value ‘a2', that is not available in the parent key R.A, thus it violates the referential integrity constraint within the relation S.
wh
During the deletion of a tuple two cases can happen: Deletion of tuple in relation having the foreign key: In this type of case simply delete the desired tuple. For example, in
Why do you go for sorting your query results? SQL SELECT command to fetch data from MySQL table. Whenever you select rows, the MySQL server is free to return them in any order
What is an E-R model? Draw an E-R Diagram for the company database with following Descriptions? The company is organized within departments. Each department has a unique name a
define lock conversion
(a) Differentiate between information and data . (b) List and briefly explain five potential benefits of the database approach compared to conventional file systems. (c) Diff
External failure : A failure can also result because of an external cause, such as earthquakes, fire, floods, etc. The database must be duly backed up to avoid troubles occurring d
What are the basic objects of the data dictionary? Tables Domains Data elements Structures Foreign Keys
Describe Object Relational model ? Object Relational Model - This model combines the characteristics of both relational model and object oriented model. It extends the tradit
Ask q“A database will be made to store information about patients in a hospital. On arrival, each patient’s personal details (name, address, and telephone number) are recorded wher
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd