Workaround :

select * from tabel
where USER_NAME() = 'user1' and utilizator in ('user1', 'user2')
union all
select * from tabel
where USER_NAME() = 'user2' and utilizator in ('user3', 'user2')
union all
select * from tabel
where utilizator  = USER_NAME()

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Ignat Andrei
http://serviciipeweb.ro/iafblog