Sensen Networks Data Analyst Interview Questions and Answers

Q1. How do you setup a Dark Store?
Ans. 
Setting up a Dark Store involves converting a retail store into a fulfillment center for online orders.
• Select a suitable location for the Dark Store, preferably in a centralized area with good access to transportation.

• Optimize the layout of the store for efficient picking, packing, and shipping of orders.

• Implement inventory management systems to track stock levels accurately and prevent stockouts.

• Train staff on order f...read more
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Q2. How do joins work in the simplest manner?
Ans. 
Joins combine data from two or more tables based on a related column.
• Joins are used to retrieve data from multiple tables based on a related column

• Common types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN

• Example: SELECT * FROM table1 INNER JOIN table2 ON table1.id = table2.id
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Q3. Write a basic query explaining the order of execution?
Ans. 
The order of execution in a query determines the sequence in which operations are performed.
• 1. The order of execution in a query typically follows the sequence: FROM, WHERE, GROUP BY, HAVING, SELECT, ORDER BY.

• 2. The FROM clause specifies the tables involved in the query.

• 3. The WHERE clause filters the rows based on specified conditions.

• 4. The GROUP BY clause groups the rows that have the same values into summary rows.

• 5...read more
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Q4. Difference between Group By and Distinct?
Ans. 
Group By is used to aggregate data based on a specific column, while Distinct is used to remove duplicate rows from a result set.
• Group By is used with aggregate functions like COUNT, SUM, AVG, etc.

• Distinct is used to retrieve unique values from a column or set of columns.

• Group By can be used to group data based on multiple columns, while Distinct operates on individual columns only.
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Q1. Create the pivot table, sort the data in ascending order
Ans. 
Create a pivot table and sort the data in ascending order.
• To create a pivot table, select the data range and go to the 'Insert' tab in Excel.

• Choose 'PivotTable' and select the location for the pivot table.

• Drag the desired fields to the 'Rows' and 'Values' areas.

• To sort the data in ascending order, click on the drop-down arrow next to the field name in the pivot table and select 'Sort A to Z'.
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Q2. Use lookup with the product based given data and find the needed data
Ans. 
Using lookup with product-based data to find the needed data.
• Use a lookup function like VLOOKUP or INDEX/MATCH to search for the needed data

• Identify the key or unique identifier to match the data

• Specify the range or table where the data is located

• Retrieve the desired data based on the lookup value
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Test was based on SQL, coding and MCQ. Coding involved nested query.

Technica questions related to sql

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Q1. Salary discussion and some hr questions
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There are 2 coding challenges and 7 objective questions

Q1. Technical questions related to role
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Q1. Output resukt number of rows basis the joins
Ans. 
The output result number of rows depends on the type of join used.
• Inner join returns only the matching rows from both tables

• Left join returns all rows from the left table and matching rows from the right table

• Right join returns all rows from the right table and matching rows from the left table

• Full outer join returns all rows from both tables

• Cross join returns the Cartesian product of both tables
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Q2. Output result number of rows basis the joins
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The question asks to output the number of rows based on joins.
• The number of rows in the output depends on the type of join used.

• Inner join only returns rows that have matching values in both tables.

• Left join returns all rows from the left table and matching rows from the right table.

• Right join returns all rows from the right table and matching rows from the left table.

• Full outer join returns all rows from both tables.

• U...read more
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Q1. SQL query use join
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Q1. What is the year-over-year growth of the product category ? Sql
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Q2. What are the days on which the temperature was higher than the previous day? Sql
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