Table: Customer
+-------------+---------+ +| Column Name | Type | ++-------------+---------+ +| id | int | +| name | varchar | +| referee_id | int | ++-------------+---------+ +In SQL, id is the primary key column for this table. +Each row of this table indicates the id of a customer, their name, and the id of the customer who referred them. ++ +
+ +
Find the names of the customer that are not referred by the customer with id = 2.
Return the result table in any order.
+ +The result format is in the following example.
+ ++
Example 1:
+ +Input: +Customer table: ++----+------+------------+ +| id | name | referee_id | ++----+------+------------+ +| 1 | Will | null | +| 2 | Jane | null | +| 3 | Alex | 2 | +| 4 | Bill | null | +| 5 | Zack | 1 | +| 6 | Mark | 2 | ++----+------+------------+ +Output: ++------+ +| name | ++------+ +| Will | +| Jane | +| Bill | +| Zack | ++------+ ++