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Given a table customer holding customers information and the referee.idnamereferee_id1WillNULL2JaneNULL3Alex24BillNULL5Zack16Mark2Write a query to return the list of customers NOT referred by the person with id'2'. For the sample data above, the result is:nameWillJaneBillZackOptionsselect namecustomerwhere referee_id is null or referee_id <> 2;select referee_idfrom customerwhere referee_id is null or referee_id <> 2;select namefrom customerwhere name is null or referee_id <> 2;select namefrom customerwhere referee_id is null or referee_id <> 2;

Question

Given a table customer holding customers information and the referee.idnamereferee_id1WillNULL2JaneNULL3Alex24BillNULL5Zack16Mark2Write a query to return the list of customers NOT referred by the person with id'2'. For the sample data above, the result is:nameWillJaneBillZackOptionsselect namecustomerwhere referee_id is null or referee_id <> 2;select referee_idfrom customerwhere referee_id is null or referee_id <> 2;select namefrom customerwhere name is null or referee_id <> 2;select namefrom customerwhere referee_id is null or referee_id <> 2;

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Solution

The correct query to return the list of customers NOT referred by the person with id '2' is:

select name
from customer
where referee_id is null or referee_id <> 2;

This query works by selecting the 'name' column from the 'customer' table where the 'referee_id' is either null (meaning the customer was not referred by anyone) or not equal to '2' (meaning the customer was not referred by the person with id '2').

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