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Example
RELATION SCHEMA for STUDENT:
STUDENT (Roll No: string, name: string, login: string, age: integer) RELATION INSTANCE
STUDENT
ROLLNO
NAME
AGE
t1 3467
Shikha
[email protected]
20
t2 4677
kanu
Where t1 = (3467, Shikha, [email protected], 20) for this relation instance, m = 2 and n = 4.
. Ashutosh Dubey who is the director of Gyan Gurukul want a three-level schema architecture for the Gyan Gurukul Company that provide better security also design a data abstraction
Determine the language that needs a user to specify the data to be retrieved with no specifying exactly how to get it is Ans: Non-Procedural DML
Normal 0 false false false EN-US X-NONE X-NONE
Define the concept of Object Diagram An object diagram shows a set of the objects and their relationships with each other at a point of time. In a static view, object diagram
Why Like predicate used for? LIKE predicate: The LIKE predicate searches for strings in which have a certain pattern.
Give a sample of the Dynamic Model. The sample of dynamic model is given below: Dynamic model for the car: Brake and Accelerator Brake or Applies Accelerator
With the linear commit protocol, sites are connected in a chain, and the subtransaction at the left-hand end of the chain initiates the protocol. Propose a crash recovery protocol
Limitations of File Based System The file-based system has some limitations. The limitations are listed as follows: Isolation and separation of data: When the data is
In a Hierarchical model of data records are organized ? In the hierarchical model of data records are organized as Tree structure.
Domain Constraint It shows that each attribute in a relation has to contain an atomic value only from the corresponding domains. The data types associated with commercial RDBMS
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