Guided Project: Answering Business Questions using SQL_____

Hi there, can anyone tell me if I’ve got the right answers to the 4 additional questions in the ‘Next steps’ section?
Also if there are more efficient ways to get the results.

Guided Project_ Answering Business Questions using SQL.ipynb (37.4 KB)

https://app.dataquest.io/m/191/guided-project%3A-answering-business-questions-using-sql/7/next-steps

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