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Explain I command in QBE ?
I : It is the command in QBE that is used to insert tuple (s) into the database
It is mandatory that for every table in the LDB hierarchy there should exist one GET statement in the report. False. It is not essential.
Explain the Weak Entity Set An Entity set which does not have sufficient attribute to make a primay key is known as weak entity set. For instance, dependents of an employee in
Question 1 Explain the concept of Foreign Key. How a foreign key differs from a Primary Key? Can the Foreign Key accept nulls? Question 2 With a necessary example explain (i)
What types of adjustments are required to increase chances of inheritance. a) Some attributes can be added or ignored in the base class operation b) Some changes can be
(A) For the relation; CarSales (RegNo, BuyerName, Address, SalesPerson, Make, Model, Commission) The following functional dependences hold, RegNo _ID à Make, Model Reg
Most computer systems authenticate users by asking them for the user name and password. However, the user names and passwords often can be guessed by hackers. Suggest an automated,
What is a shadow copy scheme? It is simple, but efficient, scheme known as the shadow copy schemes. It is based on making copies of the database called shadow copies that singl
define normalisation and functional dependency
The users who use easy-to-use menu are called ? The users who use easy to use menu are called as Naïve users.
1. Which model is used to store data in tree structures Ans: Hierarchical model is used to store data in tree structures
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