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Developer-C 11.1
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create table customer (id int, name varchar(9), referee_id int)
insert into customer values(1, 'Will', null)
insert into customer values(2, 'Jane', null)
insert into customer values(3, 'Alex', 2)
insert into customer values(4, 'Bill', null)
insert into customer values(5, 'Zack', 1)
insert into customer values(6, 'Mark', 2)
SELECT name FROM customer WHERE COALESCE(referee_id,2) <> 2;
name
Zack
SELECT name FROM customer WHERE referee_id <> 2 or referee_id is null;
name
Will
Jane
Bill
Zack