1. SQL joins, aggregate functions, union, nested select
2. When would you use mean squared error vs. mean absolute error as a loss function?
3. How would you calculate correlation between numerical variables? Non-numerical variables?
4. When would you not want to use accuracy as a validation metric?
5. What is your go-to model for binary classification and why?

Question

1. SQL joins, aggregate functions, union, nested select
2. When would you use mean squared error vs. mean absolute error as a loss function?
3. How would you calculate correlation between numerical variables? Non-numerical variables?
4. When would you not want to use accuracy as a validation metric?
5. What is your go-to model for binary classification and why?

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