Dexlock Interview Questions and Answers

I was given a pdf file containing 3 Problem statements along with the output for which I had to write SQL queries.

Q1. Theoretical Questions related to SQL were asked like types of join, the difference between union and join, related to my project, and some behavioral questions.
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Q2. What are different types of Joins?
Ans. 
Joins are used to combine data from two or more tables based on a related column between them.
• Inner Join: returns only the matching rows from both tables

• Left Join: returns all rows from the left table and matching rows from the right table

• Right Join: returns all rows from the right table and matching rows from the left table

• Full Outer Join: returns all rows from both tables

• Cross Join: returns the Cartesian product of b
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Q3. What is the Difference between Union and Joins
Ans. 
Joins combine rows from two or more tables based on a related column, while unions combine rows from two or more tables with the same structure.
• Joins are used to combine data from different tables based on a related column

• Unions are used to combine data from tables with the same structure

• Joins can be inner, left, right, or full, while unions are always a combination of all rows

• Joins can have multiple conditions, while ...read more
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Q1. Scenario-based questions on SQL
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Q1. Questions related to me like what my parents do etc. and their company profile.
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Q1. Javascript based coding question
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SQL AND POWERBI related questions

Q1. Describe oops concept.
Ans. 
OOPs concept stands for Object-Oriented Programming, which is a programming paradigm based on the concept of objects.
• OOPs focuses on creating objects that contain both data and methods to manipulate that data.

• It emphasizes concepts like inheritance, encapsulation, polymorphism, and abstraction.

• Inheritance allows a class to inherit properties and behavior from another class.

• Encapsulation restricts access to certain comp...read more
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