Lumiq Data Engineer Interview Questions and Answers

3 SQL and 2 Python questions were asked, SQL was moderate, Python was tough

Python and SQL questions were asked

Q1. I was asked about the project
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Q1. ACID properties of DBMS
Ans. 
ACID properties ensure data integrity in DBMS: Atomicity, Consistency, Isolation, Durability.
• Atomicity ensures that all operations in a transaction are completed successfully or none at all.

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

• Isolation ensures that multiple transactions can be executed concurrently without affecting each other.

• Durability ensures that once...read more
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Q1. HR question and family background
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Python , dictionary operations

Q1. Family background
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Q2. Location and salary
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Q1. Spark based questions and coding questions
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Q1. What are acid properties,tell about decorator in python,list comprehension questions,project explanation
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General Aptitude Questions

Q1. Queries on SQL, Basic Statistic Question related to normal curve, Basic Python question(from python interview question list of any website)
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Q2. Shape of normal Distribution
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The shape of a normal distribution is bell-shaped and symmetrical.
• A normal distribution has a peak at the mean and tails that extend to infinity in both directions.

• The distribution is symmetrical, meaning that the left and right halves mirror each other.

• The standard deviation determines the spread or width of the distribution.

• Many natural phenomena and measurements in various fields follow a normal distribution.

• Example...read more
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Q3. Valuess of mean median and mode
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Mean, median, and mode are measures of central tendency in statistics.
• Mean is the average of a set of numbers, calculated by summing all the values and dividing by the total count.

• Median is the middle value in a sorted list of numbers. If there is an even number of values, it is the average of the two middle values.

• Mode is the value that appears most frequently in a set of numbers. It can be a single value or multiple
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Q1. General HR questions
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Q1. General discussion round with ceo and about projects
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Q1. Ranking code in sql
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Ranking code in SQL
• Use the RANK() function to assign a rank to each row based on a specified column

• Use the ORDER BY clause to determine the order of ranking

• Handle ties in ranking using the DENSE_RANK() function

• Use the ROW_NUMBER() function to assign a unique number to each row
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Q2. Read a file using python
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To read a file using Python, use the open() function and specify the file path and mode.
• Use the open() function to open the file

• Specify the file path and mode (e.g., 'r' for reading)

• Read the contents of the file using the read() method

• Close the file using the close() method
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Q3. Reverse a array string using python
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Reverses an array of strings using Python.
• Use the reverse() method to reverse the array in-place.

• Alternatively, use slicing with a step of -1 to create a new reversed array.

• Remember to convert the array to a list before reversing if necessary.
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