Data Economy Software Intern Interview Questions and Answers for Freshers

Aptitude test was quite easy; it had normal intelligence questions as well as some math

The coding test consisted of 2 medium HackerRank questions in any language

Q1. I had a face-to-face virtual interview. The interview round went for 45 minutes. They asked all sort of questions, from JAVA to SQL to basic Python. Also, DSA questions were asked.
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Q2. Difference between Truncate, Delete and Drop
Ans. 
Truncate removes all rows from a table, Delete removes specific rows, and Drop deletes the entire table structure.
• Truncate is a DDL command that removes all rows from a table but keeps the table structure intact.

• Delete is a DML command that removes specific rows based on a condition.

• Drop is a DDL command that deletes the entire table structure along with all its data.

• Truncate is faster than Delete as it does not log in...read more
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Q3. Difference between Sets, Lists, Tuples
Ans. 
Sets, Lists, and Tuples are all data structures in Python with different characteristics and use cases.
• Sets are unordered collections of unique elements. Example: {1, 2, 3}

• Lists are ordered collections of elements that can be modified. Example: [1, 2, 3]

• Tuples are ordered collections of elements that cannot be modified. Example: (1, 2, 3)
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Q1. Round 4 was another face-to-face interview with a senior.
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Q1. MCQ questions testing your knowing in aptitude, logical reasoning, English and speech.
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Q2. 2 basic programs which you could solve using Java.
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Q1. Basic questions related to Java like "Mention 2 OOPS concepts, their definition, advantages, difference between stack and array, etc."
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Q2. Execute a basic SQL query in online SQL compiler.
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Q3. Java program to find if an Array List contains duplicate elements using online Java compiler.
Ans. 
Java program to check for duplicate elements in an ArrayList of strings.
• Iterate through the ArrayList and use a HashSet to store elements as you go.

• If an element is already in the HashSet, it is a duplicate.

• Return true if duplicates are found, false otherwise.
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Q1. Surprisingly, the most difficult round by far. The HR asked in depth about my project, so don't include projects which you are not very in-depth with. Also asked me to introduce myself without mentioning g...read more
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There are three sections: -
1. Quants
2. English
3. Reasoning
All sections are accessible medium but you have maintained the speed and accuracy.
after that coding snippet are in java/python.

Code snippets are there in coding sections.

Q1. There was simple DSA question ,
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C++

Q1. Opps concepts, DSA algorithm
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Q1. Tell me about yourself
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Q2. Explain your project
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Q3. What's your strongest programming language
Ans. 
My strongest programming language is Java.
• Extensive experience with Java programming

• Proficient in object-oriented programming

• Familiar with Java frameworks like Spring and Hibernate
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Aptitude, reasoning, verbal plus 2 programming questions which you have to solve in Java

Q1. Mention and explain 2 OOPS concepts
Ans. 
Encapsulation and Inheritance are two important OOPS concepts.
• Encapsulation: Bundling data and methods that operate on the data into a single unit. Example: Class with private data members and public methods.

• Inheritance: Ability of a class to inherit properties and behavior from another class. Example: Subclass inheriting from a superclass.
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Q2. Difference between Stack and Array
Ans. 
Stack is a data structure that follows Last In First Out (LIFO) principle, while an array is a data structure that stores elements in contiguous memory locations.
• Stack is dynamic in size, while array has a fixed size.

• Stack operations include push and pop, while array operations include random access.

• Example: Stack can be implemented using arrays, but arrays cannot be implemented using stacks.
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Q3. Write a program to check if an arraylist contains a duplicate element
Ans. 
Program to check for duplicate elements in an arraylist of strings
• Iterate through the arraylist and use a HashSet to store unique elements

• If an element is already in the HashSet, it is a duplicate

• Return true if a duplicate is found, false otherwise
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Q1. Talk about yourself for 2 minutes without mentioning things like CGPA, marks, etc.
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Q2. Indepth questions about project
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