Vertoz Data Engineer Interview Questions and Answers

It was a 100-minute test consisting of mcqs and one coding question on articulation points in the graph.

Q1. What is the difference between Postgresql and MySQL?
Ans. 
Postgresql is known for its advanced features and support for complex queries, while MySQL is popular for its ease of use and speed.
• Postgresql is known for its advanced features such as support for complex queries, indexing, and JSON data types.

• MySQL is popular for its ease of use, speed, and compatibility with various platforms.

• Postgresql has a strong focus on standards compliance and extensibility, while MySQL is mor...read more
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Q2. What are ACID properties in DBMS?
Ans. 
ACID properties in DBMS ensure data integrity and consistency in transactions.
• Atomicity: All operations in a transaction are completed successfully or none at all.

• Consistency: Data is always in a valid state before and after a transaction.

• Isolation: Transactions are executed independently without interference from other transactions.

• Durability: Once a transaction is committed, changes are permanent and cannot be lost.

• E...read more
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Q1. What is invoke controller?
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Q2. What is facade in laravel?
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Q1. Difference between union and union all in SQL?
Ans. 
Union combines and removes duplicates, Union All combines without removing duplicates.
• Union combines result sets and removes duplicates

• Union All combines result sets without removing duplicates

• Union is slower than Union All as it involves removing duplicates

• Example: SELECT column1 FROM table1 UNION SELECT column1 FROM table2;

• Example: SELECT column1 FROM table1 UNION ALL SELECT column1 FROM table2;
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Q2. How to show top 5 in pandas?
Ans. 
To show top 5 in pandas, use the nlargest() function.
• Use the nlargest() function with the 'n' parameter set to 5 to get the top 5 values in a pandas DataFrame.

• For example: df['column_name'].nlargest(5) will return the top 5 values in the specified column.
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Q1. If we have 3 numerical columns, which chart is a better representation these column?
Ans. 
A scatter plot is a better representation for 3 numerical columns.
• Use a scatter plot to show the relationship between the numerical columns.

• Scatter plots are effective for visualizing correlations and patterns in data.

• Each point on the plot represents a data point with values from all 3 columns.
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They gave me case study in interview based on that I had provide the solution.

Q1. They asked question regarding SQL, statistics and some project related questions
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Basic general English language

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Q1. It's good to give interview
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Q1. What is oops concepts
Ans. 
Object-oriented programming concepts that focus on classes and objects
• Encapsulation: Bundling data and methods that operate on the data into a single unit (class)

• Inheritance: Ability of a class to inherit properties and behavior from another class

• Polymorphism: Ability to present the same interface for different data types

• Abstraction: Hiding the complex implementation details and showing only the necessary features
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