Group by alias (Oracle)

Question

How to \'group by\' a query using an alias, for example:

select count(*), (select * from....) as alias_column 
from table 
group by alias_column

Answer 1

If you don't have to use an alias you could do it this way:

select  
EXTRACT(year from CURRENT_DATE), count(*) from something
group by EXTRACT(year from CURRENT_DATE)
order by EXTRACT(year from CURRENT_DATE)

Instead of using alias and subquery.