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Explain the differences between a left join, right join, inner join, and outer join?

Can you discuss your real-world experience with NLP and its use in recommender systems?

Describe the assumptions of linear regression, and why they are important to consider when interpreting results?

Please tell me about a time when you had to change the way you worked.

If you took a risk, tell me about it.

How does the R-square measure fall short in providing a complete picture of linear regression model performance? What does it imply about the linear regression model when you encounter a low R-square?

What optimization algorithms can you list from your repertoire? How would you tackle the challenge of optimizing a problem with a million variables? What is the principle behind the simplex algorithm in optimization?

What's your strategy for implementing a dynamic programming technique to seek out the longest rising subarray?

Write code to implement a text wrapper that takes in a long string and a character limit as inputs and returns a list of strings, where each string is limited to the specified number of characters, split only at spaces. For example, if the input string is "This is a long sentence that needs to be wrapped", and the character limit is 10, the output should be a list with three strings: ["This is a", "long", "sentence that", "needs to be", "wrapped"].

What is the average amount of transactions for customers who have recently made more than 10 purchases in the last 90 days?