Filter data from multiple sql columns

Question

I am in need of help with a database, it would be to do a distinct with several columns, for example:

and the exit would be:

You could do this on sql server?

Thanks in advance

Answer 1

select distinct coluna
from
(
 select coluna1 coluna from tabela
 union
 select coluna2 from tabela
 union
 select coluna3 from tabela
 union
 select coluna4 from tabela
)