ZS BTS Engineer Interview Questions and Answers

Q1. What are the differences between SQL and NoSQL databases, and what are the applications of NoSQL databases?
Ans. 
SQL databases are structured and relational, while NoSQL databases are flexible and non-relational, suited for varied data types.
• SQL databases use structured query language (e.g., MySQL, PostgreSQL).

• NoSQL databases are schema-less and can handle unstructured data (e.g., MongoDB, Cassandra).

• SQL databases are ideal for complex queries and transactions.

• NoSQL databases excel in scalability and performance for large dataset...read more
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Q2. What is MapReduce, and how does it differ from Apache Spark?
Ans. 
MapReduce is a programming model for processing large data sets, while Apache Spark is a fast, in-memory data processing engine.
• MapReduce processes data in two phases: Map (data processing) and Reduce (aggregation).

• Apache Spark offers in-memory processing, which speeds up data processing compared to MapReduce's disk-based approach.

• MapReduce is typically slower due to its reliance on disk I/O, while Spark can perform ta...read more
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Q3. Guesstimate on some coins based question
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Q4. Can you write a pseudocode for a sorting algorithm you are familiar with?
Ans. 
This pseudocode outlines the Bubble Sort algorithm, a simple sorting technique that repeatedly steps through the list.
• 1. Start with an unsorted array of strings, e.g., ['banana', 'apple', 'cherry'].

• 2. Compare each pair of adjacent elements.

• 3. If the first element is greater than the second, swap them.

• 4. Repeat the process for each element in the array until no swaps are needed.

• 5. The array is sorted when a full pass is...read more
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Q1. Resume project discussion in depth.
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Q2. Build sql query and then the interviewer provided with some situations for which queries need to be written.
Ans. 
SQL queries can be crafted to address various data retrieval and manipulation scenarios effectively.
• Use SELECT to retrieve data: Example - SELECT * FROM patients WHERE age > 30;

• Use JOIN to combine tables: Example - SELECT a.name, b.disease FROM patients a JOIN diagnoses b ON a.id = b.patient_id;

• Use WHERE for filtering: Example - SELECT * FROM appointments WHERE date = '2023-10-01';

• Use GROUP BY for aggregation: Examp...read more
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Apti was easy, most of the questions were easy to solve

Q1. Listening test- some sentences were given, they had to be spoken by you, this was pretty easy round
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Q2. Speaking test- few topics were given, like fav. sports, dream house, and what do you do on weekends?
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