Please solve the following sql problem and give the relational algebra type answer for each question and explain it. I will definitely give you helpful evaluation if you finished it, thank you!I will definitely give you helpful evaluation if you finished it, thank you!

8. Identify staff with low customer ratings in the last [date]. Display the staff name, number of ratings and average rating. Display 1 row for each staff. 9. Identify the number of transactions performed by staff at the [address] branch in the last [date]. Display 3 columns: staff first name, last name and number of transactions. 10. Identify all accounts that were closed in the [date]. Display the customer's name, account number and final balance. 11. Identify the best bank customers in [location]. Display the customer's name and balance of all accounts. Describe your criteria used to identify the best customers