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?
Ans. 
Invoke controller is a component in a software application that manages the flow of requests and responses between the user interface and the backend services.
• Manages the communication between user interface and backend services

• Handles the routing of requests to appropriate functions or methods

• Coordinates the flow of data and actions within the application
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Q2. What is facade in laravel?
Ans. 
Facade in Laravel is a design pattern that provides a simple interface to a complex subsystem.
• Facade provides a static interface to classes that are available in the application's service container.

• It is used to simplify the usage of complex classes by providing a simpler interface.

• Facade allows you to access Laravel's features without needing to instantiate objects or use dependency injection.

• Example: The Auth facade ...read more
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Q1. Build a MMX Model for the dataset given and share the insights
Ans. 
Build a MMX Model for a given dataset and share insights
• Preprocess the data by handling missing values and encoding categorical variables

• Split the data into training and testing sets

• Build the MMX model using appropriate algorithms like decision trees or random forests

• Evaluate the model using metrics like accuracy, precision, recall, and F1 score

• Interpret the model results to gain insights and make data-driven decisions
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Q2. How to evaluate Time series analysis
Ans. 
Time series analysis can be evaluated by examining the accuracy of forecasts, the model's ability to capture trends and patterns, and the overall performance metrics.
• Evaluate forecast accuracy using metrics like Mean Absolute Error (MAE) or Root Mean Squared Error (RMSE)

• Assess the model's ability to capture trends and patterns by visualizing the data and comparing it to the model's predictions

• Analyze the overall perfor...read more
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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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Q1. Why XG boost Than random forest
Ans. 
XGBoost is preferred over Random Forest due to its faster execution speed and better performance in complex datasets.
• XGBoost is faster than Random Forest due to its optimized implementation of gradient boosting algorithm.

• XGBoost generally performs better in complex datasets with high-dimensional features.

• XGBoost allows for more fine-tuning of hyperparameters compared to Random Forest.

• XGBoost has regularization techniqu...read more
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Q2. About Projects experience
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Basic general English language

Basic question