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What is polymorphism in OOP?

Polymorphism allows the actions of an object to be hidden.

Polymorphism allows objects of different classes to respond uniformly to the same interface, which facilitates the creation of more flexible and extensible code.

Polymorphism allows working only the most relevant part of a class.

Polymorphism is the inheritance between parent and child classes.

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What is a primary key in a database?

A primary key refers to a field in another table.

It is a collection of data.

It is a field of type string.

A primary key is a field that is uniquely identified for each record in a table.

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Given an integer n, return a string array answer where:

answer[i] == “FizzBuzz” if i is divisible by 3 and 5.
answer[i] == “Fizz” if i is divisible by 3.
answer[i] == “Buzz” if i is divisible by 5.
answer[i] == i (as a string) if none of the above conditions are true

Input: n = 15

Output: [“1″,”2″,”Fizz”,”4″,”Buzz”,”Fizz”,”7″,”8″,”Fizz”,”Buzz”,”11″,”Fizz”,”13″,”14″,”FizzBuzz”]

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Given the following array and an integer, return the indices of 2 numbers that sum to the given integer.

Input: nums = [2,7,11,15] target = 9

Output: [0,1]

Explanation: The sum of position 0 and 1 of the array return as result 9. 2 + 7 = 9

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What is the pillar of object-oriented programming that promotes code reuse?

Polymorphism

Encapsulation

Abstraction

Inheritance

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Given an array of integers, returns a new array with unique elements eliminating duplicates.

Input: arr = [23,4,5,7,4,23,8]

Output: [23, 4, 5, 7, 8]

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Given the following array returns the total number of indexes that are out of order.

Input: heights = [1,1,4,2,1,3].

Output: 3

Explanation: By sorting the array [1,1,1,1,2,3,4] we can verify that 3 positions are out of order, position 2,4 and 5.

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Given the following array of integers, returns the smaller number.

Input: arr = [23,456,89,1,34]

Output: 1

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Which SQL query updates the name of a customer with ID 123 in a table "customers"?

UPDATE customers SET name = ‘NewName’ WHERE id = 123

UPDATE customers SET name = ‘NewName’

UPDATE customers SET * WHERE id = 123

UPDATE customers SET name = ‘NewName’, id = 123

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10.

What is inheritance in object-oriented programming and what is its purpose?

It allows a class to inherit properties and methods from another class, which encourages code reuse and the creation of class hierarchies

Allows classes to inherit responsibilities from another class.

It allows overwriting methods from one class to another.

It allows the attributes and methods of a class to be protected.

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11.

SQL clause used to filter the records in a table based on a specific condition.

INNER JOIN

SET

GROUP BY

WHERE

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12.

Given the following array of integers return a new array with the numbers from the original array that are primes.

Input: arr = [12,3,5,9,7]

Output: [ 3, 5, 7 ]

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13.

Reverses the following string.

Input: “Hello World”.

Output: “dlroW olleH”.

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14.

What is the function of the constructor method in OOP?

It allows to destroy the object when the class is instantiated.

It has the function of assigning static values of an object that will never change.

It has the main function of initializing an object when an instance of a class is created and it is called automatically when we instantiate the class.

It has the function of overwriting a method of another class.

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15.

What is the SQL query to select all records in a table named "customers"?

SELECT * FROM customers

SELECT * FROM customers WHERE id = 1

SELECT FROM customers

SELECT name FROM customers

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16.

What does the encapsulation pillar mean in object-oriented programming?

Encapsulation means inheriting attributes and methods from another class.

Encapsulation means reusing code.

Encapsulation means hiding the internal details of an object and exposing only the interface necessary to interact with it.

Encapsulation only extracts the most relevant parts of a class.

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17.

SQL query fetching unique records from a "city" column in a "customers" table?

SELECT UNIQUE city FROM customers

SELECT LIKE city FROM customers

SELECT DISTINCT city FROM customers

SELECT city FROM customers

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18.

Given the following array of integers, sort it in ascending order using the insertion sort algorithm.

Input: arr = [56,89,45,34,90]

Output: [34,45,56,89,90]

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19.

It is the pillar of object-oriented programming that consists of identifying the essential characteristics of an object and its relevant behaviors, omitting non-essential details.

Inheritance

Polymorphism

Abstraction

Encapsulation

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20.

What is the difference between a class and an object in OOP?

An object is the methods of the class.

A class is a blueprint or template that defines the structure and behavior of objects, while an object is a concrete instance of that class.

An object is the template that defines methods and attributes and the class is the instance.

The class is a template for the object.

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