Coditas Technologies AWS Data Engineer Interview Questions and Answers

Q1. Reverse a string
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Q1. How to remove duplicate values from dataset
Ans. 
Use pandas library in Python to remove duplicate values from dataset
• Import pandas library in Python

• Use drop_duplicates() method on the dataset

• Specify columns to check for duplicates if needed

• Example: df.drop_duplicates(subset=['column_name'])
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Q2. Difference between zip and enumerate
Ans. 
zip is used to combine two lists into a list of tuples, while enumerate is used to add a counter to an iterable.
• zip function takes two lists and combines them into a list of tuples

• enumerate function adds a counter to an iterable and returns it as an enumerate object

• Example for zip: zip([1, 2, 3], ['a', 'b', 'c']) will result in [(1, 'a'), (2, 'b'), (3, 'c')]

• Example for enumerate: enumerate(['apple', 'banana', 'cherry']...read more
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Q1. General questions
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Q2. Excel Questions
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Excel Assignment on building a dashboard

Easy 1 coding
Medium 1 coding
It was about arrays and sorting techniques and other is about your common sense

Q1. Mainly about core java
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Q2. Mainly about SQL , My SQL and different type of joins etc
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Q1. Pivot table in excel
Ans. 
Pivot table is a data summarization tool in Excel.
• Pivot table allows users to summarize and analyze large datasets.

• It can be used to group data by categories, calculate totals, and create custom calculations.

• Users can easily change the layout of the table to view data in different ways.

• Pivot table is a powerful tool for data analysis and reporting.

• Example: A sales manager can use pivot table to analyze sales data by re
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Q2. How to count data in excel
Ans. 
To count data in Excel, use the COUNT function or select the data and look at the status bar.
• Use the COUNT function to count the number of cells that contain numbers or dates

• Use the COUNTA function to count the number of cells that are not empty

• Select the data and look at the status bar to see the count of selected cells

• Use the COUNTIF function to count cells that meet a specific criteria
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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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Q1. In depth spark fundamentals
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Q2. Data Modelling case studies
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