Zinier Interview Questions and Answers

Basic Hacker Rank SQL Questions 2 . and 10 MCQ based

Q1. Select customer, sum(amt ) as total_amt from t1 group by customer how many no. of rows it will return and explain this table t1 column name-> dept customer item amt
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Q2. Select * , sum(amt) over (partition by customer) as total_amt from t2
Ans. 
The query selects all columns and calculates the total amount for each customer in table t2.
• The query uses a window function to calculate the sum of 'amt' for each customer in the 't2' table.

• The 'partition by customer' clause divides the result set into partitions based on the 'customer' column.

• The 'select *' statement selects all columns from the table along with the calculated total amount.

• The 'sum(amt) over (partiti...read more
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Q3. How many Customers has purchased same item on the Same day more than onnce
Ans. 
To find customers who purchased the same item multiple times on the same day.
• Identify unique customers who purchased the same item multiple times on the same day

• Check for duplicate transactions by customer and item on the same day

• Aggregate the data to count the number of customers who made multiple purchases of the same item on the same day
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Q1. Core java based questions, followed by springboot and then sql queries
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Q1. Scenario based java and spring boot questions and more complex sql queries
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Q1. Previous project related questions like difficulty faced in project, how you overcome that, day to day routine, discussed role in projects
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Q1. Salary discussion and onboarding instructions
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Q1. ACID Properties
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ACID properties are a set of properties that guarantee reliable and consistent transactions in a database system.
• Atomicity ensures that either all operations in a transaction are completed successfully or none at all.

• Consistency ensures that the database remains in a valid state before and after the transaction.

• Isolation ensures that the concurrent execution of transactions results in a system state that would be obtai...read more
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Q2. What are Idempotent HTTP Requests?
Ans. 
Idempotent HTTP requests are requests that can be repeated multiple times without changing the result beyond the initial request.
• Idempotent requests have the same outcome no matter how many times they are executed.

• GET, PUT, and DELETE HTTP methods are typically idempotent.

• POST requests are not idempotent as they can create new resources with each execution.
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Q3. Questions regarding your project, and how did you learn from the projects and tasks assigned to you?
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Q4. System Design
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Q1. About yourself, your past work experience and why you want to get into this role The interviewer was very calm and just wanted to learn about the background.
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Q1. All behavioural questions- 1 how do your prioritise your work? 2 do you have experience in managing cross functional teams? 3 what if one of your Co-worker decline working on a project, How would you tackl...read more
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Q1. Again all behavioural questions- How do you work with large volume of works? How do you manage work life balance? How do you give harsh feedbacks to your coworkers?
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Q1. All behavioural questions again- same as above just a bit here and there asked in different ways
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Q1. Questions related to devops tools such as azure terraform kubernetes.
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Q2. Java concurrency and exception handling
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Q1. Why do you want to join this organization?
Ans. 
I am impressed by the company's innovative approach to DevOps and its commitment to continuous improvement.
• I am excited about the opportunity to work with cutting-edge technologies and tools in a collaborative environment.

• I admire the company's strong reputation for fostering professional growth and development.

• I believe my skills and experience align well with the organization's goals and values.
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Q2. Expected salary
Ans. 
My expected salary is based on my experience, skills, and the market rate for Devops Engineers.
• I have researched the average salary range for Devops Engineers in this location.

• I am looking for a competitive salary that reflects my expertise and contributions.

• I am open to discussing salary based on the overall compensation package offered.
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A 90-minute coding test on HackerRank, which includes one medium, one easy, and one hard question.

Q1. What is the index of the first occurrence where a pattern string matches with a text string?
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Q2. Given a string, how can we find the minimum length substring whose sum is greater than or equal to a specified target?
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