12th Class Computer Science Chapter 4 Short Questions with Answers Online Preparation

Question # 1

Define Transitive Dependency .

Ans 1: Transitive Dependency is a functional dependency in a relation between two (or more) non-key attributes.It is also defined as "It states that in a relation R, if an attribute B is functionally dependent on an attribute A,and the attribute C is functionally dependent on the attribute B This implies that the attributes C is functionally dependent on the attribute A.

Question # 2

Define partial dependency .

Ans 1: A partial functional dependency exist when one or more non- key attributes (Such as NAME) are functionally dependent on part (but not all) of the primary key

Question # 3

What is Normalization?

Ans 1: Normalization:Normalization is the process of converting complex data structures into simple and stable data structures. It is based on the analysis of functional dependence . In other words, Normalization is a technique for reviewing the entity/ attributes lists to that attributes are stored " where they belongs ".it is base for a relational data base system .There are three Forms of Normalization:a) First Normal Formb) Second Normal Formc) Third Normal Form

Question # 4

Define Insertion Anomaly.

Ans 1: An Insert Anomaly occurs when certain attributes cannot be inserted into the database without the presence of other attributes. For Example this is the converse of delete anomaly.we can't add a new course unless we have at least one student enrolled on the course.

Question # 5

Define Synonym?

Ans 1: A synonyms is created when two different names are used from the same information (Attributes) . If an attributes resides in more than one entity , make sure that all entities use the same attribute name.

Question # 6

How is Entity Integrity attained?

Ans 1: The entity integrity can be attained by specifying primary key in a relation. When a primary key constraint is specified on a relation, the DBMS automatically applies the entity integrity on the attribute that is used as primary key .

Question # 7

Define Entity Integrity.

Ans 1: Entity Integrity is a constraint on primary values that states that no attribute of a primary key should contain nulls.

Question # 8

How first normal form is achieved?

Ans 1: A relation R is in First Normal Form if and only if all underlying domains contain atomic values only.The Pre-requisite is that, A relation has a always a primary key associated with it. Thus, we can define it as follow:1) All entities must have a key,composed of a combination of one or more attributes which uniquely one occurrence of the entity.2) For any single occurrence of an entity,each attribute must have one and only one value or "An attributes must have no REPEATING GROUPS".

Question # 9

Write types of Anomalies?

Ans 1: Database Anomalies: Anomalies are problems that can occur in poorly planned, un-normalized database where all the data is stored in one table (a flat -file database)Types of Anomalies:a) Insertion Anomalyb) Deletion Anomalyc) Modification Anomaly

Question # 10

Define Mutual Exclusive of data.

Ans 1: Mutually exclusive data exist when attributes occur whose values can be expressed as "Yes/no" indicators , cannot all be true for any single entity.

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ICS Part 2 Computer Science Chapter 4 Short Questions Test With Answer

Online Short Questions For Chapter 4 "ICS Part 2 Computer Science Chapter 4 Short Questions Preparation "

Computer Science - ICS Part 2 Computer Science Chapter 4 Short Questions Preparation

Define Transitive Dependency .

Define partial dependency .

What is Normalization?

Define Insertion Anomaly.

Define Synonym?

How is Entity Integrity attained?

Define Entity Integrity.

How first normal form is achieved?

Write types of Anomalies?

Define Mutual Exclusive of data.

Prepare Complete Set Wise Questions For Chapter 4 "ICS Part 2 Computer Science Chapter 4 Short Questions Preparation "

Set 1

ICS Part 2 Computer Science Chapter 4 Short Questions Preparation - Set 1

Define Transitive Dependency .

Define partial dependency .

What is Normalization?

Define Insertion Anomaly.

Define Synonym?

How is Entity Integrity attained?

Define Entity Integrity.

How first normal form is achieved?

Write types of Anomalies?

Define Mutual Exclusive of data.

12th Computer Science Chapter 4 Preparation

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