Schlumberger Interview Questions, Process, and Tips

If everyone is cheating you should also do it?

Q1. Everyhting about project..
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Q2. Linear vs logistic regression
Ans. 
Linear regression is used for continuous variables, while logistic regression is used for binary outcomes.
• Linear regression is used to predict a continuous outcome based on one or more input variables.

• Logistic regression is used to predict the probability of a binary outcome based on one or more input variables.

• Linear regression assumes a linear relationship between the independent and dependent variables, while logist...read more
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Q3. Normalization in dbms
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Normalization in DBMS is the process of organizing data in a database to reduce redundancy and improve data integrity.
• Normalization involves breaking down data into smaller, more manageable tables and establishing relationships between them.

• It helps in reducing data redundancy, minimizing data anomalies, and improving data consistency.

• There are different normal forms such as 1NF, 2NF, 3NF, BCNF, and 4NF, each with spec...read more
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Q4. List array difference etc
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Array difference is finding the elements that are present in one array but not in another.
• Use set operations like difference to find elements in one array but not in another.

• Example: arr1 = ['a', 'b', 'c'], arr2 = ['b', 'c', 'd'], arr_diff = set(arr1) - set(arr2) = ['a']
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Just easy or medium level leetcode questions

The topic was how AI is affecting softare developer

Q1. SQL table distributions.
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Q2. ADF switching questions?
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Q3. How do you optimize the performance?
Ans. 
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?
Ans. 
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?
Ans. 
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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It was a group presentation

Q1. What is DCA analysis in reservoir?
Ans. 
DCA analysis in reservoir refers to Decline Curve Analysis, a method used to estimate future production rates of oil and gas wells.
• DCA is a common technique in reservoir engineering to forecast production decline over time.

• It involves fitting a decline curve to historical production data to predict future performance.

• Different decline curve models like exponential, hyperbolic, and harmonic are used depending on the res...read more
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