rite an SQL command that will find any customers who have not placed orders.

Query $2$: List the names and number of employees supervised $($label this value HeadCount$)$ for each supervisor who supervises more than two employees.

Query $3$: List the name of each employee, his or her birth date, the name of his or her manager, and the manager$$s birth date for those employees who were born before their manager was born; label the manager$$s data Manager and ManagerBirth.

Query $4$: Write an SQL command to display the order number, customer number, order date, and items ordered for some particular customer.

Query $5$: Write an SQL command to display each item ordered for order number $1,$ its standard price, and the total price for each item ordered.

Query $6$: Write an SQL command to total the cost of order number $1.$

Query $7$: Calculate the total raw material cost $($label TotCost$)$ for each product compared to its standard product price.

Query $8$: Display product ID$,$ product description, standard price, and the total cost in the result.