Omega Healthcare Data Engineer 1 Interview Questions and Answers

Q1. Difference between Sum and Sumx
Ans. 
Sum calculates the total of a column, while Sumx calculates the total of an expression evaluated for each row.
• Sum is used to calculate the total of a column in a table.

• Sumx is used to calculate the total of an expression evaluated for each row in a table.

• Sum: SUM('Table'[Column])

• Sumx: SUMX('Table', 'Table'[Column] * 2)
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Q2. How do u make groups and how bins are different from groups
Ans. 
Groups are created by categorizing data based on certain criteria, while bins are specific ranges used to group continuous data.
• Groups are created by categorizing data based on certain criteria, such as age groups or product categories.

• Bins are specific ranges used to group continuous data, such as age ranges or income brackets.

• Groups can be created based on qualitative data, while bins are used for quantitative data.

• E...read more
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Q3. Why do you prefer power bi over tableau
Ans. 
Power BI is preferred over Tableau for its seamless integration with Microsoft products and user-friendly interface.
• Seamless integration with Microsoft products like Excel, SharePoint, and Teams

• User-friendly interface with drag-and-drop functionality for easy data visualization

• Cost-effective solution for organizations already using Microsoft products

• Faster data processing and refreshing capabilities compared to Tableau

• ...read more
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Q4. Tell me about your roles and responsibilities
Ans. 
I have experience in data collection, analysis, and visualization to support decision-making.
• Collecting and cleaning data from various sources

• Analyzing data to identify trends and patterns

• Creating visualizations and reports to communicate findings

• Collaborating with stakeholders to understand business needs

• Using statistical tools and techniques to draw insights

• Presenting findings to non-technical audiences
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Aptitude test on reasoning and problem solving

Q1. What is list and tuple
Ans. 
List and tuple are both data structures in Python. Lists are mutable, ordered collections of items, while tuples are immutable, ordered collections.
• List is mutable, meaning its elements can be changed after creation

• Tuple is immutable, meaning its elements cannot be changed after creation

• List is defined using square brackets [], while tuple is defined using parentheses ()

• Example of list: my_list = [1, 2, 3]

• Example of tu
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Q2. How tableau works
Ans. 
Tableau is a data visualization tool that helps users create interactive and shareable dashboards and reports.
• Tableau connects to various data sources such as Excel, SQL databases, and cloud services.

• Users can drag and drop fields to create visualizations like charts, graphs, and maps.

• Tableau allows for interactive filtering and drilling down into data for deeper insights.

• Users can create dashboards and stories to pres...read more
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Q1. Walk through your project?
Ans. 
Developed a predictive model to forecast sales based on historical data
• Collected and cleaned historical sales data

• Performed exploratory data analysis to identify trends and patterns

• Built and trained a machine learning model using regression techniques

• Evaluated model performance using metrics like RMSE and MAE
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Q2. Behavioral questions?
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Q1. Questions based on Advanced Excel like Vlookup, Index match, sumifs, pivot tables
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Q2. Behavioral questions
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Q1. Salary negotiation
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Q1. Tell me about your self
Ans. 
I am a detail-oriented data entry operator with strong organizational skills and a passion for accuracy.
• Experienced in entering data accurately and efficiently

• Proficient in using data entry software and tools

• Strong attention to detail and ability to spot errors

• Excellent organizational skills and ability to prioritize tasks

• Ability to work independently and meet deadlines
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Q2. Reading test about Sachin Tendulkar and translate
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Power BI report for shoe case analysis.

Q1. Basic introduction about previous projects and skillsets.
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Q2. Related to Power BI, SQL
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SAS basic Programming questions

Q1. What questions can arise based on the projects mentioned in your resume?
Ans. 
Questions can arise about data sources, methodologies, insights gained, and impact of projects mentioned in resume.
• Data sources used in the projects

• Methodologies employed for data analysis

• Insights gained from the analysis

• Impact of the projects on decision-making or outcomes
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The first round consisted of a general assessment that included tests on artificial intelligence, machine learning, data science, English, and aptitude, followed by a face-to-face interview.

Q1. Spark architecture
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