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What is a cascading update?
Referential integrity constraints needs that foreign key values in one table correspond to primary key values in another. If the value of the primary key is altered -- that is, updated -- the value of the foreign key must directly be changed to match it. Cascading updates will set this alter to be done automatically by the DBMS whenever essential.
Ask questioYou are the database administrator in a university. You have been tasked to come up with a new database for the University. Using the stages in Database Life Cycle come
What is data model? Explain object based and record based data models? Ans: A data model is an abstract model in which describes how data is represented and accessed. (i)
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Discuss The difference between drop table R and delete from R. DROP TABLE command deletes all the records with the table definition. This command will automatically committed
non numeric literals
What is a database? At any given time, they're storing a tremendous amount of information - inventory, in the case of Amazon, messages and interrelationships in the case of Tw
what is object-identity
Consider the E/R schema with weak entity sets shown below. Come up with the SQL CREATE TABLE statements (with appropriate primary key, unique and foreign key constraints). Include
What are the situations while DBMS should not be used? DBMS should not be used in situations like: (i) No need of security. (ii) Not difficulty to access the data (iii) N
What is the use of keyword ISA? The use of keyword ISA is to show that a class is a specialization of another class.
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