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Developer-C 11.1
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CREATE TABLE User ( id int, username nvarchar(20), email nvarchar(20), PRIMARY KEY (id), UNIQUE(username), UNIQUE(email) );
INSERT INTO User (id, username, email) VALUES (1, 'aaron', 'aaron-email'), (2, 'aaron', 'aaron-email-2'), (3, 'bob', 'bob-email'), (4, 'bob', 'aaron-email') ;
Duplicate entry 'aaron' for key 'User.username'