Trivia Quiz On Database Management System

1. The full form of DDL is

Dynamic Data Language

Detailed Data Language

Data Definition Language

Data Derivation Language

DDL stands for Data Definition Language. It is a subset of SQL (Structured Query Language) that is used to define and manage the structure of a database. DDL statements are used to create, modify, and delete database objects such as tables, indexes, and views. Examples of DDL statements include CREATE, ALTER, and DROP. DDL is different from DML (Data Manipulation Language) which is used to retrieve, insert, update, and delete data in a database. Therefore, the correct answer is Data Definition Language.

Explanation

DDL stands for Data Definition Language. It is a subset of SQL (Structured Query Language) that is used to define and manage the structure of a database. DDL statements are used to create, modify, and delete database objects such as tables, indexes, and views. Examples of DDL statements include CREATE, ALTER, and DROP. DDL is different from DML (Data Manipulation Language) which is used to retrieve, insert, update, and delete data in a database. Therefore, the correct answer is Data Definition Language.

2. DBMS helps achieve

Data independence

Centralized control of data

Neither (A) nor (B)

Both (A) and (B)

DBMS (Database Management System) helps achieve both data independence and centralized control of data. Data independence refers to the ability to make changes to the database structure without affecting the applications that use the data. DBMS provides a layer of abstraction between the physical storage and the logical representation of data, allowing for easier modifications. Centralized control of data means that the DBMS provides a centralized location for storing and managing data, ensuring consistency, security, and efficient access. Therefore, both options (A) and (B) are correct.

Explanation

DBMS (Database Management System) helps achieve both data independence and centralized control of data. Data independence refers to the ability to make changes to the database structure without affecting the applications that use the data. DBMS provides a layer of abstraction between the physical storage and the logical representation of data, allowing for easier modifications. Centralized control of data means that the DBMS provides a centralized location for storing and managing data, ensuring consistency, security, and efficient access. Therefore, both options (A) and (B) are correct.

3. The statement in SQL which allows to change the definition of a table is

Alter.

Update.

Create.

Select.

The correct answer is "Alter" because the ALTER statement in SQL is used to modify the structure or definition of an existing table. It allows you to add, delete, or modify columns, constraints, and other table attributes. The UPDATE statement is used to modify the data within the table, not the table structure. The CREATE statement is used to create a new table, not change an existing one. The SELECT statement is used to retrieve data from the table, not modify its definition.

Explanation

The correct answer is "Alter" because the ALTER statement in SQL is used to modify the structure or definition of an existing table. It allows you to add, delete, or modify columns, constraints, and other table attributes. The UPDATE statement is used to modify the data within the table, not the table structure. The CREATE statement is used to create a new table, not change an existing one. The SELECT statement is used to retrieve data from the table, not modify its definition.

4. Which of the following are the properties of entities?

Groups

Table

Attributes

Switchboards

Entities are the objects or things that we want to store information about in a database. They can be people, places, things, or events. Properties of entities are the characteristics or attributes that describe them. These attributes provide information about the entities and help in organizing and categorizing the data. Therefore, "Attributes" is the correct answer as it correctly identifies one of the properties of entities.

Explanation

Entities are the objects or things that we want to store information about in a database. They can be people, places, things, or events. Properties of entities are the characteristics or attributes that describe them. These attributes provide information about the entities and help in organizing and categorizing the data. Therefore, "Attributes" is the correct answer as it correctly identifies one of the properties of entities.

5. The RDBMS terminology for a row is

Tuple.

Relation.

Attribute.

Degree.

In the context of relational database management systems (RDBMS), a row is referred to as a tuple. A tuple represents a single record or instance of data within a table. It consists of a collection of attributes or fields that describe the characteristics or properties of that particular record. Therefore, the term "tuple" accurately describes the RDBMS terminology for a row in a database table.

Explanation

In the context of relational database management systems (RDBMS), a row is referred to as a tuple. A tuple represents a single record or instance of data within a table. It consists of a collection of attributes or fields that describe the characteristics or properties of that particular record. Therefore, the term "tuple" accurately describes the RDBMS terminology for a row in a database table.

6. Count function in SQL returns the number of

Values.

Distinct values.

Groups.

Columns.

The count function in SQL returns the number of values. It is used to count the number of rows or records in a table or the number of values in a specific column. It does not take into account the distinct values, groups, or columns, but simply returns the total count of values.

Explanation

The count function in SQL returns the number of values. It is used to count the number of rows or records in a table or the number of values in a specific column. It does not take into account the distinct values, groups, or columns, but simply returns the total count of values.

7. A report generator is used to

Update files.

Print files on paper.

Data entry.

Delete files.

A report generator is a tool or software that is specifically designed to generate reports. These reports can be in various formats, such as PDF, Excel, or HTML, but one of the common outputs is printing the reports on paper. Therefore, the correct answer is "print files on paper."

Explanation

A report generator is a tool or software that is specifically designed to generate reports. These reports can be in various formats, such as PDF, Excel, or HTML, but one of the common outputs is printing the reports on paper. Therefore, the correct answer is "print files on paper."

8. Which of the following is a legal expression in SQL?

SELECT NULL FROM EMPLOYEE;

SELECT NAME FROM EMPLOYEE;

SELECT NAME FROM EMPLOYEE WHERE SALARY = NULL;

None of the above

The correct answer is "SELECT NAME FROM EMPLOYEE;". This is a legal expression in SQL because it follows the syntax of the SELECT statement, which is used to retrieve data from a database. The statement selects the "NAME" column from the "EMPLOYEE" table, indicating that the desired data is the names of employees.

Explanation

The correct answer is "SELECT NAME FROM EMPLOYEE;". This is a legal expression in SQL because it follows the syntax of the SELECT statement, which is used to retrieve data from a database. The statement selects the "NAME" column from the "EMPLOYEE" table, indicating that the desired data is the names of employees.

9. The result of the UNION operation between R1 and R2 is a relation that includes

All the tuples of R1

All the tuples of R2

All the tuples of R1 and R2

All the tuples of R1 and R2 which have common columns

The result of the UNION operation between R1 and R2 is a relation that includes all the tuples of R1 and R2 which have common columns. The UNION operation combines the tuples from both relations and eliminates any duplicates. In this case, only the tuples that have common columns in R1 and R2 will be included in the result. Tuples that do not have common columns will not be included.

Explanation

The result of the UNION operation between R1 and R2 is a relation that includes all the tuples of R1 and R2 which have common columns. The UNION operation combines the tuples from both relations and eliminates any duplicates. In this case, only the tuples that have common columns in R1 and R2 will be included in the result. Tuples that do not have common columns will not be included.

10. Which of the following is not the responsibility of the utilities component of DBMS software?

Creating the physical and logical designs

Removing flagged records for deletion

Creating and maintaining the data dictionary

Monitoring performance

The utilities component of DBMS software is responsible for various tasks, such as removing flagged records for deletion, creating and maintaining the data dictionary, and monitoring performance. However, creating the physical and logical designs is not one of its responsibilities. This task typically falls under the responsibility of the database administrator or the database designer, who are in charge of designing the structure and organization of the database.

Explanation

The utilities component of DBMS software is responsible for various tasks, such as removing flagged records for deletion, creating and maintaining the data dictionary, and monitoring performance. However, creating the physical and logical designs is not one of its responsibilities. This task typically falls under the responsibility of the database administrator or the database designer, who are in charge of designing the structure and organization of the database.