It is necessary to delete lines (a lot) on request, why doesn't it work, why?

Question

SQL

DELETE FROM users WHERE username IN (Artem2t76531,Artem2457,tester346,Artem245746,Artem2t56453)

Answer 1

DELETE FROM users WHERE username IN ( 'Artem2t76531', 'Artem2457', 'tester346' , 'Artem245746' , 'Artem2t56453' )

Answer 2

doesn't even write any errors? sampling under such condition works?
Well, what DBMS do you use?
you can use Truncate, but there are some troubles