Hy-Vee Senior Data Analyst Interview Questions and Answers

Q1. Find top 3 students in a class
Ans. 
Identify the top 3 students based on their grades in a class.
• Calculate the average grade for each student

• Sort the students based on their average grades in descending order

• Select the top 3 students
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Guesstimate questions

Q1. Directors ask behavioural questions
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Practice data structures and algorithms questions in general.

General aptitude questions were asked practice them

Q1. SQL and Visualizationbased questions
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Case study for business problems

Q1. Behaviour fit round
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Basic SQL and tableau questions

Q1. How do you work in a team?
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Q1. Introduce Yourself
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Q2. Your Day to Day responsibilities in current Job
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Q3. Difference between View & Temp Table? what is view in sql?
Ans. 
Views are virtual tables that display data from one or more tables, while temp tables are temporary tables that store data temporarily.
• Views are virtual tables created by a query, while temp tables are physical tables created in the database.

• Views do not store data themselves, but display data from underlying tables, while temp tables store data temporarily for a session or transaction.

• Views can be used for security pu...read more
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Q4. Sql window functions
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Q5. Sql 2 tables were given N was asked to write query.
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Q6. Filters in Tableau
Ans. 
Filters in Tableau allow users to narrow down data displayed in visualizations based on specific criteria.
• Filters can be applied to dimensions or measures in Tableau.

• Users can use filters to focus on specific subsets of data, such as a particular region or time period.

• Filters can be set up as dropdown menus, sliders, or checkboxes for user interaction.

• Example: Filtering sales data to show only results from the past yea
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Q7. Parameters in tableau
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Parameters in Tableau allow users to control the values in a visualization without modifying the underlying data.
• Parameters can be used to filter data, change calculations, or modify the appearance of a visualization.

• They can be created by defining a parameter in Tableau and then using it in calculated fields or filters.

• Parameters can be set to different data types such as string, integer, float, date, etc.

• Users can in...read more
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Q8. Types of bar charts in tableau, what is stacked bar?
Ans. 
Types of bar charts in Tableau include standard bar, stacked bar, and side-by-side bar.
• Standard bar chart displays individual bars for each category

• Stacked bar chart shows the total value broken down into sub-categories

• Side-by-side bar chart compares multiple measures across categories

• Example: Stacked bar chart can be used to show sales by region, with each region broken down by product category
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Q9. Data blending Vs Joins in tableau
Ans. 
Data blending combines data from different sources in Tableau, while joins combine data from the same source.
• Data blending is used when data comes from different sources and cannot be joined directly.

• Joins are used when data comes from the same source and can be combined based on a common key.

• Data blending allows for more complex analysis by combining unrelated data sets.

• Joins are more efficient for combining related d...read more
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Q10. Coin tossed 2 times what's prob to get both heads? what if coin is biased.
Ans. 
The probability of getting both heads when a coin is tossed 2 times is 1/4. If the coin is biased, the probability may change.
• The probability of getting both heads in a fair coin toss is 1/4 (1/2 * 1/2).

• If the coin is biased, the probability of getting both heads may be different depending on the bias.

• For example, if the coin is biased towards heads with a probability of 0.6, the probability of getting both heads would
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Q11. Difference in tree map & heat Map in tableau
Ans. 
Tree map displays hierarchical data using nested rectangles, while heat map shows data values using color intensity.
• Tree map visualizes hierarchical data with nested rectangles, where the size of each rectangle represents a measure.

• Heat map displays data values using color intensity, with darker colors indicating higher values.

• Tree map is useful for showing proportions within a whole, while heat map is effective for id...read more
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Present the case study through PPT which you already prepared before round 1. Hr reached out to me to complete case study before round 1.

Q1. Managerial Round (Technical)
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Q1. Difference between where and having
Ans. 
WHERE is used to filter rows before grouping, HAVING is used to filter groups after grouping.
• WHERE is used with SELECT statement to filter rows based on a condition

• HAVING is used with GROUP BY statement to filter groups based on a condition

• WHERE is applied before grouping, HAVING is applied after grouping

• Example: SELECT * FROM table WHERE column = 'value'

• Example: SELECT column, COUNT(*) FROM table GROUP BY column HAVIN
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Q2. View and materialised view
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Retail data case study

Case study discussion

Q1. Retail situational based questions
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Q2. Metrics used in retail business
Ans. 
Metrics used in retail business include sales, customer acquisition cost, customer lifetime value, inventory turnover, and gross margin.
• Sales: Total revenue generated from products or services sold

• Customer acquisition cost: Cost incurred to acquire a new customer

• Customer lifetime value: Predicted revenue a customer will generate over their lifetime

• Inventory turnover: Number of times inventory is sold and replaced in a ...read more
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Q1. Basic technical knowledge
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Q2. Situational and managerial round questions
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Q1. Basic salary negotiation
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Q2. Situational base question
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Write a a python code to reverse string without slicing.