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What are the types of reference?explain it with suitable examples?
Object oriented language given the ability to refer the object attribute of the type can be referred to the specified type. We can describe the type dept with a field name and a field head which is reference to the type person and a table dept of the type dept as followed
Create type dept(
Name varchar(20),
Head ref(person)scope people
)
Create table dept of dept
The table definition must state that the reverence is derived and must still state a self referential attribute name. When interesting a tuple for dept we can then use
Insert into dept
Values('CS','john')
What is hash file organization? What are the causes of bucket overflow within a hash file organization? What can be completed to decrease the occurrence of bucket overflow?
How do I use strap on?#
Define data model? A data model is a collection of conceptual tools for explaining data, data relationships, data semantics and consistency constraints.
(a) Design a query plan for the following distributed query: An application at site B wants to compute a join of STUDENT ? Id=StudId TRANSCRIPT where STUDENT (Id,Major) is at site
A file of employee have 10,000 blocks on a cylinder of a disk with characteristics r=8ms and btt=0.6ms I want to know the cost of read inthe file under following conditions for a q
Our company hires independent contractors to install equipment at precise locations across North America. We want to track the installation data and generate reports. The compan
In problems 1 - 4, you are given the columns of a table, and a set of functional dependencies. Determine the normal form of this table. Remember that the normal form is the HIGHE
You are required to implement integrity constraints within the database to enforce the following requirements: For Projects: Start date must be supplied. Start date cannot be i
What is a homogeneous distributed database? In homogeneous distributed databases, all sites have the same database management system software, are aware of one another, and agr
average response time?
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