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TN 12th Computer Applications மின்னணு தரவு பரிமாற்றம் Sample Question Papers Study Material - QB365 Set A

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12th Standard English Medium Computer Science Subject Database Concepts Creative 3 Mark Questions with Solution Part - I updated Creative Questions

Published on: 13/05/2022

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Std: 12th Standard - Computer Science

chapter: - Creative Questions

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Questions:

Generic 3

5 x 3 = 15

Write the symbol used for the following.
(i) SELECT
(ii) PROJECT
(iii) Union
(iv) Intersection
(v) Difference
(vi) PRODUCT

List the types of DBMS users.

Explain the data model that represent parent child relationship.

List the types of data model.

Write the advantages of DBMS.

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Answers Key:

Generic 3

5 x 3 = 15

(i) σ
(ii) π
(iii) U
(iv) ∩
(v) -
(vi) X

(i) Database Administrators(DBA)
(ii) Application or software developers
(iii) End User
(iv) Database designers

(i) Hierarchical model was developed by IBM as Information Management System.
(ii) In Hierarchical model, data is represented as a simple tree like structure form. This model represents a one-to-many relationship ie parent-child relationship.
(iii) One child can have only one parent but one parent can have many children. This model is mainly used in IBM Main Frame computers.

The different types of a Data Model
(i) Hierarchical Model
(ii) Relational Model
(iii) Network Database Model
(iv) Entity Relationship Model
(v) Object Model

Advantages of DBMS:
(i) Segregation of application program
(ii) Minimal data duplication or Data Redundancy
(iii) Easy retrieval of data using the Query Language
(iv) Reduced development time and maintenance