What is the purpose of indexing in a database?

To facilitate efficient data retrieval

Which of the following is not a query optimization technique used in a DBMS?

Query execution plan generation

In the context of a database, what does ACID stand for?

Atomicity, Consistency, Isolation, Durability

Access, Consistency, Integrity, Durability

Atomicity, Concurrency, Inheritance, Durability

Access, Concurrency, Integrity, Durability

Consider the following SQL statement: SELECT * FROM employees WHERE salary > 50000; What will be the result of this query?

All employees with a salary greater than 50000

All employees with a salary less than or equal to 50000

An error will occur because of incorrect syntax

No result will be returned because of incorrect usage of the WHERE clause

Which of the following SQL statements is used to add a new column called "age" of type INTEGER to an existing table called "students"?

ALTER TABLE students ADD COLUMN age INTEGER;

ADD COLUMN age INTEGER TO students;

UPDATE TABLE students ADD age INTEGER;

ALTER students ADD age INTEGER;

Consider the following SQL statement: SELECT COUNT(*) FROM orders; What will be the result of this query?

The total number of rows in the "orders" table

The number of distinct values in the "orders" table

An error will occur because of incorrect usage of the COUNT function

No result will be returned because of incorrect syntax

Consider the following SQL statement: INSERT INTO customers (name, age) VALUES ('John', 25); How many rows will be affected by this query?

An error will occur because of incorrect syntax

It depends on the existing data in the "customers" table

Consider the following SQL statement: DELETE FROM employees WHERE department = 'Sales'; What will be the result of this query?

All employees in the "Sales" department will be deleted

An error will occur because of incorrect syntax

No result will be returned because of incorrect usage of the DELETE statement

It depends on the existing data in the "employees" table

Consider the following B+ tree with order 3: [12, 15, 21, 24, 30, 34, 38, 41, 44, 49] What will be the B+ tree after inserting the value 27?

[12, 15, 21, 24, 27, 30, 34, 38, 41, 44, 49]

[12, 15, 21, 24, 27, 30, 34, 38, 41, 44, 49, 27]

[12, 15, 21, 24, 30, 27, 34, 38, 41, 44, 49]

[12, 15, 21, 24, 30, 34, 38, 41, 44, 49, 27]

Consider the following B+ tree with order 4: [10, 20, 30, 40, 50, 60, 70, 80, 90, 100] What will be the B+ tree after deleting the value 50?

[10, 20, 30, 40, 50, 60, 70, 80, 90, 100]

[10, 20, 30, 40, 60, 70, 80, 90, 100]

[10, 20, 30, 40, 60, 70, 80, 90]

[10, 20, 30, 40, 60, 70, 90, 100]

Consider the following SQL statement: SELECT DISTINCT department FROM employees; What will be the result of this query?

All distinct departments in the "employees" table

An error will occur because of incorrect usage of the DISTINCT keyword

No result will be returned because of incorrect syntax

It depends on the existing data in the "employees" table

Consider the following SQL statement: SELECT * FROM employees WHERE salary BETWEEN 30000 AND 50000; What will be the result of this query?

All employees with a salary between 30000 and 50000

An error will occur because of incorrect syntax

No result will be returned because of incorrect usage of the WHERE clause

It depends on the existing data in the "employees" table

Consider the following SQL statement: SELECT MAX(salary) FROM employees; What will be the result of this query?

The maximum salary in the "employees" table

The average salary in the "employees" table

An error will occur because of incorrect usage of the MAX function

No result will be returned because of incorrect syntax

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