Random Trees Data Analyst Interview Questions and Answers

Q1. Coalesce, SQL Order of Execution
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Q2. Given a table with fields(id, name, salary, managerId) find out the managers who have atleast 5 reportees under him/her.
Ans. 
Use SQL query to count number of reportees for each manager and filter out those with atleast 5 reportees.
• Write a SQL query to count number of reportees for each manager using GROUP BY clause

• Add HAVING clause to filter out managers with atleast 5 reportees

• Example: SELECT managerId, COUNT(id) AS num_reportees FROM table_name GROUP BY managerId HAVING num_reportees >= 5
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Q3. How to manage large datasets in python
Ans. 
Use libraries like pandas and dask to efficiently manage large datasets in Python.
• Use pandas library for data manipulation and analysis.

• Use dask library for parallel computing and out-of-core processing.

• Optimize memory usage by loading data in chunks or using data types efficiently.

• Consider using cloud services like AWS S3 or Google BigQuery for storing and processing large datasets.
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Q4. Name few of the commonly used python libraries used by DA
Ans. 
Some commonly used Python libraries for Data Analysts are Pandas, NumPy, Matplotlib, and Scikit-learn.
• Pandas - used for data manipulation and analysis

• NumPy - used for numerical computing and working with arrays

• Matplotlib - used for data visualization

• Scikit-learn - used for machine learning and data mining
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1 python question and 1 sql question for coding and rest were the mcqs based on sql and python.

Q1. Python code was asked for checking the anagrams
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Q2. Sql code asked to solve on screen share using various use cases like group by, having, count
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Q1. Python code was asked for swaping any number but without using python libraries
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Q2. Sql code was asked using concepts of rank dense,rank, partition by
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DURATION 1.3 HRS WITH REASONING AND 2 CODING QUESTION

Q1. SQL QUESTION FIND N TH HIGHEST SALARY
Ans. 
Use SQL query with ORDER BY and LIMIT to find the Nth highest salary.
• Use ORDER BY clause to sort salaries in descending order

• Use LIMIT to specify the Nth highest salary

• Example: SELECT salary FROM employees ORDER BY salary DESC LIMIT N,1
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Q2. SQL QUESTION PIVOT TABLE QUESTION
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Q1. Any question wtihtout i'm very honested and cearfully
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Q2. My goal setting and my hobby ect.
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Q1. Give a small Introduction about yourself
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Q2. Why do you want to switch from your previous company ?
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Q1. Difference Between Union and Union All
Ans. 
Union combines and removes duplicates, Union All combines without removing duplicates
• Union combines result sets and removes duplicates

• Union All combines result sets without removing duplicates

• Union is slower than Union All as it involves removing duplicates

• Example: SELECT column1 FROM table1 UNION SELECT column1 FROM table2;

• Example: SELECT column1 FROM table1 UNION ALL SELECT column1 FROM table2;
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Q2. SQL Execution order
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Q3. Coalesce function in SQL
Ans. 
Coalesce function in SQL is used to return the first non-null value in a list of expressions.
• Coalesce function takes multiple parameters and returns the first non-null value.

• It is commonly used to handle null values in SQL queries.

• Example: SELECT COALESCE(column_name, 'N/A') FROM table_name;
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Q1. Basic to Intermediate SQL Based questions
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Q2. Basic to Intermediate Python Based questions
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