Base on the Sample DB created, please write the SQL query for the Questions below:
1. Show the total employee in the employees table .
2. Find the employees with multiple records with same email (Hint: using Having)
3. How many unique orders in the orderdetails table.
4.List the latest ten orders in the orderdetails table.
5. Find the order with largest amount ( Quantity * unit price) in the orderdeatils table.
6. Delete the order with order number 10100 in the orders table.
7. why it will be failed when you run the query 6?