Zoomcar Data Engineer Interview Questions and Answers

Sql test in Hackerrank

Q1. Questions on SQL was asked
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Q1. Managerial round. I was asked questions on case study for captain acquisition
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Test duration of 1 hour based on probability and control statements

Q1. Ml algorithms that you have prior knowledge about
Ans. 
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
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Q2. Data visualization techniques you have studied and used
Ans. 
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
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Q1. Previous company experience and current company roles and responsibilities
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I'm knowlege of c language

Q1. Aney question of c language
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Q2. And data base and etc
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Q1. SQL related questions like joins
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Q2. Types of join in sql
Ans. 
Types of join in SQL include inner join, left join, right join, and full outer join.
• Inner join returns only the matching records from both tables.

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

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

• Full outer join returns all records when there is a match in either the left or rig
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Q3. Practical use of left join
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A left join is used to combine data from two tables based on a common column, including all records from the left table.
• Left join returns all rows from the left table and the matching rows from the right table.

• It is useful when you want to retrieve all records from the left table, even if there are no matches in the right table.

• The result of a left join will have NULL values in the columns from the right table where th...read more
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Q4. Number of rows after applying certain join operations
Ans. 
The number of rows after applying join operations depends on the type of join used and the data in the tables being joined.
• Inner join retains only the rows that have matching values in both tables

• Left join retains all rows from the left table and the matched rows from the right table

• Right join retains all rows from the right table and the matched rows from the left table

• Full outer join retains all rows when there is a
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Q5. Difference between vlookup in excel and some function in sql
Ans. 
VLOOKUP in Excel is used to search for a value in a table and return a corresponding value, while SQL functions like JOIN and WHERE are used to retrieve data from multiple tables based on specified conditions.
• VLOOKUP is specific to Excel and works on a single table, while SQL functions can work on multiple tables.

• VLOOKUP requires the table to be sorted in ascending order, while SQL functions do not have this requiremen...read more
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Simple SQL & Excel test

Q1. Will Face hiring Manager
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Test was based on SQL, coding and MCQ. Coding involved nested query.

3 questions easy-medium level leetcode problem I solved 2 completely and 3rd question partially (9/15 test cases passed) to move on to 2nd round

Q1. Implement an app similar to splitwise
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