NEC Data Analyst Interview Questions and Answers

Q1. What is join in sql
Ans. 
Join in SQL is used to combine rows from two or more tables based on a related column between them.
• Join is used to retrieve data from multiple tables based on a related column

• Types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN

• Example: SELECT * FROM table1 INNER JOIN table2 ON table1.column = table2.column
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Q2. What is primary key
Ans. 
Primary key is a unique identifier for each record in a database table.
• Primary key ensures each record in a table is uniquely identified

• It must contain unique values and cannot have NULL values

• Primary key can be a single column or a combination of columns

• Example: 'ID' column in a 'Users' table can be a primary key
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Q1. Technical assigment in excel, vlookup, pivot table, power Query
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Q1. Couple of leetcode medium questions (i think it was around 3 questions) and they had their own platform
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Q1. Tell me about the project you have worked recently
Ans. 
Developed a predictive analytics model to forecast customer churn for a telecom company
• Used Python and SQL to clean and analyze customer data

• Implemented machine learning algorithms such as logistic regression and random forest

• Evaluated model performance using metrics like accuracy, precision, and recall
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Q2. What kind of forecasting have you done
Ans. 
I have experience in time series forecasting using statistical models and machine learning algorithms.
• Utilized ARIMA model to forecast sales data for a retail company

• Implemented Prophet algorithm to predict stock prices for a financial institution

• Used LSTM neural network for demand forecasting in supply chain management
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Excel assessment- was made to make a report from multiple sheets

Hybrid Work 90 sec to speak

Q1. Related to resume and experience
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