607 Sales Person

Description

Table: SalesPerson

• sales_id is the primary key column for this table.
• Each row of this table indicates the name and the ID of a salesperson alongside their salary, commission rate, and hire date.

Table: Company

• com_id is the primary key column for this table.
• Each row of this table indicates the name and the ID of a company and the city in which the company is located.

Table: Orders

• order_id is the primary key column for this table.
• com_id is a foreign key to com_id from the Company table.
• sales_id is a foreign key to sales_id from the SalesPerson table.
• Each row of this table contains information about one order. This includes the ID of the company, the ID of the salesperson, the date of the order, and the amount paid.

Problem Statement

Write an SQL query to report the names of all the salespersons who did not have any orders related to the company with the name “RED”.

Return the result table in any order. The query result format is in the following example.

Example 1:

Input:

• SalesPerson table:

• Company table:

• Orders table:

Output:

Explanation:

• According to orders 3 and 4 in the Orders table, it is easy to tell that only salesperson John and Pam have sales to company RED, so we report all the other names in the table salesperson.

Solution

Here, you need to report salesperson name. In this problem, you first find out all orders with company name “RED”. Then, you find out all salesperson who have not made any orders with company “RED” using NOT IN clause to filter out the salesperson who had any orders with company “RED”.

1SELECT name 
2    FROM SalesPerson 
3    WHERE sales_id NOT IN (
4        SELECT sales_id 
5            FROM Orders
6            LEFT JOIN Company 
7            ON Orders.com_id = Company.com_id
8            WHERE Company.name = 'RED'
9    );