Alibaba Group Big Data Engineer Interview Questions and Answers

Q1. Data entry Training
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Q2. Work from home 12th pass
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Q3. Work from home 12 pass house wife
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Q4. Data entry training one week kudunga sir
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Q5. 8 hours work one week or six days
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Q1. Apache Spark and it's working
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Q2. Past Experience
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Q1. Git version control question
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Q2. Python med DSA question
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Basic Apititude Questions

Q1. Difference between WHERE and HAVING??
Ans. 
WHERE is used to filter rows before grouping, HAVING is used to filter groups after grouping.
• WHERE is used with SELECT statement to filter rows based on a condition

• HAVING is used with GROUP BY statement to filter groups based on a condition

• WHERE is applied before data is grouped, HAVING is applied after data is grouped

• Example: SELECT * FROM table WHERE column = 'value'

• Example: SELECT column, COUNT(*) FROM table GROUP B
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Q2. Where- Row Level Filters Having-Aggregate Filters
Ans. 
Row level filters are applied before aggregations, while aggregate filters are applied after aggregations.
• Row level filters are used to filter individual rows of data before any aggregations are performed.

• Aggregate filters are used to filter the aggregated results after the data has been grouped and summarized.

• Row level filters are typically applied using WHERE clause in SQL, while aggregate filters are applied using H...read more
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Q1. Why do you wanna join Uber?
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Q2. Best Company Ever
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Q1. About yourself in brief
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Q2. Some computer questions related to Training and typing
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Typing test to check the typing speed.

Asked a few questions regarding my experience

Q1. What are the key metrics you would be working with with EaseMyTrip?
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Aptitude test is a way for employers to assess a candidate's abilities through a variety of different testing formats. Aptitude tests will test your ability to perform tasks and react to situations at work. This includes: problem-solving.

Q1. Tell me something about yourself. How did you hear about this position? Why do you want to work here?
Ans. Hi thank you for giving me this opportunity to introduce my self lakshmi r am basically from doddballapur i graduate in b. Com from banglore north university
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Q2. What is your greatest strength? What are your strengths and weaknesses? What do you know about this company/organization?
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Q1. Sort an array if an array has only 0,1,2s
Ans. 
Sort an array of strings containing only 0s, 1s, and 2s.
• Use three pointers to keep track of the positions of 0s, 1s, and 2s in the array.

• Iterate through the array and swap elements based on the values of the pointers.

• Example: Input array = ['1', '0', '2', '1', '0'], Output array = ['0', '0', '1', '1', '2']
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Q2. Longest palindromic substring
Ans. 
Find the longest palindromic substring within a given string.
• Iterate through each character in the string and expand around it to find palindromes.

• Keep track of the longest palindrome found so far.

• Consider both odd and even length palindromes.
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