Datamatrix Technologies Data Analyst Interview Questions and Answers

The Aptitude Test session accesses mathematical and logical reasoning abilities

Q1. What is Vlookup
Ans. 
Vlookup is a function in Excel used to search for a value in a table and return a corresponding value from another column.
• Vlookup stands for 'Vertical Lookup'

• It is commonly used in Excel to search for a value in the leftmost column of a table and return a value in the same row from a specified column

• Syntax: =VLOOKUP(lookup_value, table_array, col_index_num, [range_lookup])

• Example: =VLOOKUP(A2, B2:D10, 3, FALSE) - searc...read more
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Q2. Some IF else Question in Excel
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Q3. What does your day in your previous organization look like?
Ans. 
My day in my previous organization involved analyzing large datasets, creating reports, and presenting findings to stakeholders.
• Reviewing and cleaning large datasets to ensure accuracy

• Creating visualizations and reports to communicate insights

• Collaborating with team members to identify trends and patterns

• Presenting findings to stakeholders in meetings or presentations
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Q4. Could you share the technical skills you possess?
Ans. 
I possess strong technical skills in data analysis, including proficiency in programming languages, statistical analysis, and data visualization tools.
• Proficient in programming languages such as Python, R, SQL

• Skilled in statistical analysis and data modeling techniques

• Experience with data visualization tools like Tableau, Power BI

• Knowledge of machine learning algorithms and techniques
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Q5. Can you explain what a Pivot Table is?
Ans. 
A Pivot Table is a data summarization tool used in spreadsheet programs to analyze, summarize, and present data in a tabular format.
• Pivot tables allow users to reorganize and summarize selected columns and rows of data to obtain desired insights.

• Users can easily group and filter data, perform calculations, and create visualizations using pivot tables.

• Pivot tables are commonly used in Excel and other spreadsheet program...read more
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Q6. Find the Highest-paid employee in each department along with their salary and department name.
Ans. 
To find the highest-paid employee in each department, we need to group employees by department and then select the employee with the highest salary in each group.
• Group employees by department

• Find the employee with the highest salary in each group

• Retrieve the employee's name, salary, and department name
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Aptitude test for selection.

Q1. What is your understanding of data analytics?
Ans. 
Data analytics involves analyzing raw data to draw conclusions and make informed decisions.
• Data analytics involves collecting, processing, and analyzing data to identify trends and patterns.

• It helps businesses make data-driven decisions and improve performance.

• Techniques used in data analytics include data mining, machine learning, and statistical analysis.

• Examples of data analytics in action include predicting custome...read more
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Q2. What is the significance of data analytics in analyzing and visualizing data?
Ans. 
Data analytics is crucial for extracting insights and patterns from data, and visualizing them in a meaningful way.
• Data analytics helps in identifying trends, patterns, and correlations within large datasets.

• It enables businesses to make informed decisions based on data-driven insights.

• Visualizations such as charts, graphs, and dashboards make complex data easier to understand and interpret.

• Data analytics can uncover h...read more
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Q1. Python string is changable or not
Ans. 
Python strings are immutable, meaning they cannot be changed once created.
• Python strings are immutable, so any operation that appears to modify a string actually creates a new string object.

• For example, when you use string concatenation or slicing, a new string is created instead of modifying the original string.

• To modify a string in Python, you would need to create a new string with the desired changes.
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Q2. Sql window function ?
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Q3. Difference between having and where cause
Ans. 
HAVING is used with GROUP BY to filter groups, WHERE is used to filter rows
• HAVING is used with GROUP BY clause to filter the groups based on aggregate functions

• WHERE is used to filter rows based on conditions

• HAVING is applied after the GROUP BY clause, WHERE is applied before

• HAVING can only be used with SELECT statement that contains a GROUP BY clause

• Example: SELECT department, AVG(salary) FROM employees GROUP BY depar...read more
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Q4. Sql union and union all
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Q5. Python using remove duplicate value
Ans. 
Use Python's set() function to remove duplicate values from an array of strings.
• Convert the array to a set to automatically remove duplicates

• Convert the set back to a list if needed
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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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Q1. I'm changing my domain because I don't see much scope for growth in my current domain and I want to make advantage of new opportunities for learning, creativity and success. Additional, I believe that the ...read more
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Q2. I understand that being asked to work for an extended number of hours comes with a good reason in the first place, so I'm ok with it.
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Q3. Over the year I have really upskilled my self. I believe based on the market standards for this particular role and my experience and skill set a salary range between 10000- 35000 would be fair and appreci...read more
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Q4. Can you share more about the day to day responsibilities of this role?
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Q5. If I am hired for this role, what would you want me to a achieve in my first two months?
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Q6. No ma'am certainly not. Before coming here, I read the job description thoroughly and I have the right skills and qualification required for the role.
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Q7. I believe a change in work environment with stimulate my creativity and drive for success.
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Coding 2 questions java

Q1. Lot of questions based on resume Oops questions 2 basic coding
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Q1. Basic questions
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Q1. Sql questions checking ur knowledge
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Q2. Self join questions about sql
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Q1. Tell me about your self
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Q2. If experienced, then Tell me about your previous job role and responsibilities of previous job role.
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Q3. Tell me about your resume.
Ans. 
My resume showcases my experience in data analysis, including proficiency in SQL, Python, and data visualization tools.
• Proficient in SQL for data querying and manipulation

• Skilled in Python for data analysis and automation

• Experience with data visualization tools like Tableau and Power BI

• Strong analytical and problem-solving skills

• Previous projects include analyzing sales data to identify trends and patterns
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Q4. Tell me about your memorable Moment of life.
Ans. 
My memorable moment was when I graduated from college.
• Graduating from college after years of hard work

• Celebrating with family and friends

• Feeling a sense of accomplishment and pride
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