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Multiple choice accountancy application of electronic spreadsheet in accounting introduction and importance of ms excel micosoft office rational data model (rdm)

Which of the following statements are correct for Relational Data Model (RDM):
a. Relational Data Model (RDM) is the most popular and widely used in actual practice.
b. Relational data model represents the database as collection of relations, which resembles  a table of values. 

  1. Only "a" is correct.

  2. Only "b" is correct.

  3. Both "a" and "b" are correct.

  4. None of the above is correct.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The relational data model represents the database as collection of relations, which resembles a table of values (or data table). Each row of the table, therefore, represents a collection of related data values and hence typically corresponds to real world entity or relationship. Among several representational models, Relational Data Model (RDM) is the most popular and widely used in actual practice. 

Multiple choice accountancy application of electronic spreadsheet in accounting introduction and importance of ms excel micosoft office rational data model (rdm)

The value of each attribute of a relation must be an indivisible value and drawn out of possible values associated with its ________. 

  1. Entity

  2. Key

  3. Domain

  4. Referential
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The domain is one of the constraints, which can be specified on relational databases. The value of each attribute of a relational must be an indivisible value and drawn out of possible values associated with its domain. The value of an attributed, therefore, must conform to the data type associated with the domain.

Multiple choice accountancy application of electronic spreadsheet in accounting introduction and importance of ms excel micosoft office rational data model (rdm)

A ________ state is a set of relation states such that every relational database state satisfies the integrity constraints specified on relational database schema.

  1. Accounting database

  2. Relational database

  3. data management

  4. Database technology
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A relational database schema is a set of relation schemas and a set of integrity constraints. A relational database is a set of relation states such that every relational database state satisfies the integrity constraints specified on relational database schema.

Multiple choice accountancy application of electronic spreadsheet in accounting introduction and importance of ms excel micosoft office rational data model (rdm)

The ___________ model represents the database as collection of relations, which resembles a table of values (or data table).

  1. relational data

  2. entity integrity

  3. referential integrity

  4. entity relationship
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The relational model organizes data into tables (relations) consisting of rows and columns. This structure is the foundation of relational database management systems.

Multiple choice accountancy application of electronic spreadsheet in accounting introduction and importance of ms excel micosoft office rational data model (rdm)

While key and entity constraints are specified on individual relation, the referential integrity constraints is specified between _________ relations. 

  1. one or more

  2. two or more

  3. one or two

  4. none of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

While key and entity constraints are specified on individual relation, the referential integrity constraints is specified between two or more relations. This constraint is specified to maintain consistency among the tuples of such relations.

Multiple choice accountancy application of electronic spreadsheet in accounting introduction and importance of ms excel micosoft office rational data model (rdm)

The two categories of operations on relational model are ______ and ______.

  1. Insert, Delete

  2. Updates, Retrieval

  3. Updates, Delete

  4. Retrieval, Insert
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A relational database schema is a set relation schemas and integrity constraints. It is a set of relation states such that relational database state satisfies the integrity constraints specified on relational database schema. There are two categories of operations on relational model: updates and retrieval. Update operation are of three basic types i.e. insert, delete and modify. Retrieval operation on relational data model does not cause violation of any integrity constraints.