SunTec Web Services Data Analyst Interview Questions and Answers

Q1. Core python,python library and data science
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Q1. Mathematics,python and sql and data science are complete
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Q1. How SQL DB works
Ans. 
SQL DB works by storing and managing data in a structured format using tables and relationships.
• SQL DB uses tables to store data in rows and columns.

• It allows for querying data using SQL commands like SELECT, INSERT, UPDATE, DELETE.

• Relationships between tables can be established using foreign keys.

• Indexes can be used to optimize query performance.

• ACID properties ensure data integrity and consistency.
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Basic data structures, puzzles questions and statistics problems

Q1. What was your previous company project
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Q2. What are different types of indexing
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Different types of indexing include primary indexing, secondary indexing, clustered indexing, and non-clustered indexing.
• Primary indexing: Index based on the primary key of a table, typically implemented using a B-tree structure.

• Secondary indexing: Index based on a non-primary key column, allowing for faster retrieval of data based on that column.

• Clustered indexing: Physically reorders the table based on the indexed co...read more
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Q3. How does random forest work
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Random forest is an ensemble learning method that builds multiple decision trees and merges their predictions.
• Random forest creates a set of decision trees from randomly selected subsets of the training data.

• Each tree in the random forest independently predicts the outcome, and the final prediction is made by averaging the predictions of all the trees.

• Random forest is effective in handling high-dimensional data and can...read more
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Q4. Explain over fitting
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Overfitting occurs when a model learns the noise in the training data rather than the underlying pattern.
• Overfitting happens when a model is too complex and captures noise in the training data.

• It leads to poor generalization to new, unseen data.

• Regularization techniques like L1/L2 regularization can help prevent overfitting.

• Cross-validation can be used to detect and prevent overfitting.

• Example: A decision tree with too...read more
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Q5. Explain macros inExcel
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Macros in Excel are automated sequences of commands that can be created to perform repetitive tasks.
• Macros can be recorded or written using Visual Basic for Applications (VBA)

• They can automate tasks such as formatting, data manipulation, and calculations

• Macros can be assigned to buttons or keyboard shortcuts for easy access

• They can save time and reduce errors in repetitive tasks
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Easy question. Easy to clear the round

Q1. One to one technical questions based on SQL and python.
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Aptitude test had questions like upstream, downstream, etc

SQL questions and 2 live python coding questions

Q1. About your self
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Q2. Communication skills
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Q1. Programming language
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Q2. What tools do you utilize for data analysis?
Ans. 
I utilize tools such as Excel, Python, SQL, and Tableau for data analysis.
• Excel for basic data manipulation and visualization

• Python for advanced data analysis and machine learning

• SQL for querying databases

• Tableau for creating interactive visualizations
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Q3. Pandas numpy seaborn matplot
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Data analysis of code in the context of data analysis.

Coding logical question paper.

1. 2 coding questions - easy to medium type.
2. Basic machine learning/data science MCQ's

Q1. 1. Resume based questions. 3. Machine learning/deep learning/data science related common questions. 4.Data proprocessing, data cleaning common interview questions.
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Q2. Questions related to projects done.
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