Quinbay SDE (Software Development Engineer) Interview Questions and Answers

Q1. What do u mean by data
Ans. 
Data refers to facts, statistics, or information collected for analysis or reference.
• Data is raw, unprocessed information.

• It can be in the form of numbers, text, images, or any other format.

• Examples include customer names, product prices, and sales figures.

• Data can be structured (organized in a specific way) or unstructured (not organized).
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Q2. What is preprocessed data
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Preprocessed data is data that has been cleaned, transformed, and organized for analysis or modeling.
• Preprocessed data is often used in machine learning and data analysis to improve the accuracy and efficiency of models.

• Common preprocessing steps include removing missing values, scaling features, and encoding categorical variables.

• Examples of preprocessing techniques include normalization, standardization, one-hot enco
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Q3. What do u mean by info
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Info refers to data or knowledge that provides details or context about a specific topic or subject.
• Info can be in the form of facts, statistics, or explanations.

• It helps to understand a topic better or make informed decisions.

• Examples of info include news articles, research papers, and educational resources.
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Q4. How to copy from 2 tables and paste in 3rd one in sql
Ans. 
Use SQL INSERT INTO SELECT statement to copy data from 2 tables and paste into a 3rd table.
• Use INSERT INTO SELECT statement to copy data from 2 tables and paste into a 3rd table.

• Specify the columns you want to copy from each table in the SELECT statement.

• Make sure the columns in the SELECT statement match the columns in the 3rd table where you are pasting the data.
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Q5. Reverse string using any language you know
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Reverse a string using any programming language
• Use built-in functions like reverse() or slice() in languages like Python or JavaScript

• Iterate through the string in reverse order and append each character to a new string

• Use a stack data structure to push each character onto the stack and then pop them off to reverse the string
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Q6. A puzzle question was asked but i don't remeber it.
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2 coding questions medium to hard level

Q1. Doubly Linkeded List
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Q2. How to find if the Singly Linked List is cyclic or not in optimal way
Ans. 
Use Floyd's cycle detection algorithm to find if a Singly Linked List is cyclic or not.
• Use two pointers, slow and fast, where slow moves one step at a time and fast moves two steps at a time.

• If there is a cycle, the two pointers will eventually meet at some point.

• If the fast pointer reaches the end of the list (null), then there is no cycle.
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Q3. DBMS Normalisation
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Aptitude test was easy but difficult

Q1. Technical questions linked list
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Q2. Array binary search Dp
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It was online assessment

Q1. Questions were mainly from oops c++ and database management
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Q2. What is four pillars of oops. What is array and vector. Implement queue using stack. Project based questions.
Ans. 
The four pillars of OOP are encapsulation, inheritance, polymorphism, and abstraction. Arrays are fixed-size data structures, while vectors are dynamic arrays. A queue can be implemented using two stacks.
• Encapsulation: Bundling data and methods that operate on the data into a single unit.

• Inheritance: Creating new classes based on existing classes, inheriting their attributes and methods.

• Polymorphism: Objects of differe...read more
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Q3. Four pillars of opps
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The four pillars of object-oriented programming are encapsulation, inheritance, polymorphism, and abstraction.
• Encapsulation: Bundling data and methods that operate on the data into a single unit.

• Inheritance: Allowing a new class to inherit properties and behavior from an existing class.

• Polymorphism: The ability for objects of different classes to respond to the same message.

• Abstraction: Hiding the complex implementatio...read more
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Q4. What is dbms explain
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DBMS stands for Database Management System. It is a software system that allows users to define, create, maintain and control access to databases.
• DBMS is a software system that manages databases.

• It allows users to define, create, maintain, and control access to databases.

• DBMS provides tools for data manipulation, retrieval, and security.

• Examples of DBMS include MySQL, Oracle, SQL Server, and PostgreSQL.
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Q5. What isSQL.and some queries
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Q1. Introduction, what is sdlc, what is bug life cycle, white box testing, functional testing,smoke and sanity testing.
Ans. 
SDLC is Software Development Life Cycle, Bug Life Cycle is the process of a bug from detection to resolution, White Box Testing is testing based on internal code structure, Functional Testing is testing the functionality of the software, Smoke and Sanity Testing are initial tests to check basic functionality.
• SDLC is a process followed for software development, consisting of phases like planning, design, coding, testing...read more
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Q2. What stlc and what is regression
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STLC stands for Software Testing Life Cycle, which is a process used to test software products. Regression testing is retesting of software after changes to ensure no new bugs are introduced.
• STLC is a series of steps followed to ensure high-quality software testing, including planning, designing, executing, and reporting.

• Regression testing is the process of retesting software to confirm that recent changes have not adv...read more
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