Schlumberger Data Engineer Interview Questions and Answers

Q1. SQL table distributions.
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Q2. ADF switching questions?
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Q3. How do you optimize the performance?
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Performance optimization in data engineering involves tuning queries, indexing, partitioning, and utilizing appropriate hardware.
• Tune queries by optimizing SQL code, using appropriate joins, and avoiding unnecessary operations.

• Utilize indexing to speed up data retrieval by creating indexes on frequently queried columns.

• Partition data to distribute it across multiple nodes or servers for parallel processing.

• Utilize appr...read more
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Q4. What is stored procedure?
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A stored procedure is a set of SQL statements that can be saved and reused in a database management system.
• Stored procedures are used to perform a specific task or set of tasks in a database.

• They can accept input parameters and return output parameters.

• Stored procedures can improve performance by reducing the amount of data sent between the database and the application.

• They can also enhance security by controlling acce...read more
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Q5. Ranking functions in SQL?
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Ranking functions in SQL are used to assign a rank to each row based on a specific criteria.
• Ranking functions include RANK(), DENSE_RANK(), and ROW_NUMBER()

• RANK() assigns a unique rank to each distinct row

• DENSE_RANK() assigns a unique rank to each distinct row without gaps

• ROW_NUMBER() assigns a unique sequential integer to each row
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Q6. Modelling questions.
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Reverse a binary tree and few other technical questions

Q1. Data structure and Oops concepts were asked
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Q1. Technical round on projects that we have worked on and questions around that
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Q1. General HR questions
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Q1. More of like a general conversation with the center manager
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Q1. Question as per my skill set from SQL, Unix, Power Center Mappings.
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Q1. In detail questions on skill sets and writing logic and flow diagram for one of the problem statement
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Q1. General discussion on expectations and the requirments
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Q1. Don't remember the exact questions
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