5. Write an SQL query to list each salesperson who has sold desks and the number of units sold by each salesperson. In the ca se where the Salespersonld is empty please print -99 5b. Repeat the previous query to list each salesperson who has sold desks and also the product description of these desks. Now find the number of units sold by each salesperson and for each description. In the case where the Salespersonld is empty please print -99. 5. Write an SQL query to list each salesperson who has sold desks and the number of units sold by each salesperson. In the ca se where the Salespersonld is empty please print -99 5b. Repeat the previous query to list each salesperson who has sold desks and also the product description of these desks. Now find the number of units sold by each salesperson and for each description. In the case where the Salespersonld is empty please print -99