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

Question # 1

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 # 2

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 # 3

What is homonym?

Ans 1: A homonym is created when same name is used for two attributes. Consider the following example :Customer SupplierCompany_Name Company_NameWe Should use Supplier _Name instead of Company _Name in Supplier

Question # 4

Define 3rd normal form .

Ans 1: A relation is in third normal form (3 NF) if it is in 2 NF and no transitive dependencies exist.A more precise definition for 3 NF is : "A non-key attribute must not depend on any other non-key attributes " or if a non-key attributes value can be obtained simply by Knowing the value of another non-key attribute, the relation is not in 3 NF.

Question # 5

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 # 6

What is meant by referential integrity?

Ans 1: Referential Integrity is a constraint on foreign key values that states that if a foreign key exist in a relation than either the foreign key value must match the primary key value of some tuple in its home relation or the foreign key value must be completed null.

Question # 7

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 # 8

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 # 9

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 # 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

How is Entity Integrity attained?

What is Normalization?

What is homonym?

Define 3rd normal form .

Define Entity Integrity.

What is meant by referential integrity?

Define Synonym?

Define partial dependency .

How first normal form is achieved?

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

How is Entity Integrity attained?

What is Normalization?

What is homonym?

Define 3rd normal form .

Define Entity Integrity.

What is meant by referential integrity?

Define Synonym?

Define partial dependency .

How first normal form is achieved?

Define Mutual Exclusive of data.

12th Computer Science Chapter 4 Preparation

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