10+ Diebold Nixdorf Interview Questions and Answers

Stored procedures are pre-written SQL codes that can be saved and reused. They are used to improve performance and security.

• Stored procedures are used to reduce network traffic by executing a batch of SQL statements at once.

• They can improve performance by reducing the amount of time spent parsing and optimizing SQL statements.

• Stored procedures can also enhance security by allowing access to only specific parts of the database.

• Examples of stored procedures include creating a n...read more

The finding from the project was that there is a strong correlation between customer satisfaction and repeat purchases.

• The project analyzed customer satisfaction surveys and purchase data

• The data showed that customers who reported high satisfaction scores were more likely to make repeat purchases

• This finding suggests that improving customer satisfaction can lead to increased customer loyalty and revenue

Three things I learned from my Data Science and Analytics course are statistical analysis, data visualization, and machine learning.

• Statistical analysis: Learned how to use statistical methods to analyze data and draw conclusions.

• Data visualization: Learned how to create visual representations of data to better understand patterns and trends.

• Machine learning: Learned how to use algorithms to build predictive models and make data-driven decisions.

SQL query to get the second row from the top.

• Use the LIMIT keyword to limit the number of rows returned.

• Use the OFFSET keyword to skip the first row.

• Order the rows by a column to ensure consistent results.

The data process in my project involves data collection, cleaning, analysis, and visualization.

• Data collection involved gathering data from various sources such as surveys, databases, and APIs.

• Data cleaning was done to remove duplicates, missing values, and outliers.

• Data analysis was performed using statistical methods and machine learning algorithms.

• Data visualization was used to present the findings in a clear and concise manner.

• The process was iterative, with each step inf...read more

DBMS is a software system to manage databases, while RDBMS is a type of DBMS that uses a relational model.

• DBMS stands for Database Management System, while RDBMS stands for Relational Database Management System.

• DBMS can manage any type of database, while RDBMS uses a specific model based on tables, keys, and relationships.

• DBMS is less strict in terms of data integrity, while RDBMS enforces strict rules to ensure data consistency.

• Examples of DBMS include MongoDB and Cassandra,...read more

I have studied and used various data visualization techniques including bar charts, line graphs, scatter plots, and heat maps.

• I have experience creating bar charts to compare data across categories

• I have used line graphs to show trends over time

• I have created scatter plots to identify correlations between variables

• I have used heat maps to visualize data density and identify patterns

I have prior knowledge about various machine learning algorithms.

• Linear Regression

• Logistic Regression

• Decision Trees

• Random Forests

• Support Vector Machines

• Naive Bayes

• K-Nearest Neighbors

• Gradient Boosting

• Neural Networks

It is estimated that there are around 10 million cars in Bangalore.

• Bangalore is one of the major cities in India with a high population density and increasing urbanization.

• The number of cars in Bangalore has been steadily increasing due to rising income levels and improved road infrastructure.

• As of 2021, there are approximately 10 million cars registered in Bangalore.

• This estimate includes both private and commercial vehicles.

• The actual number may vary slightly due to factors...read more