Can i do this in one statement

Question

Assuming I have the following column:
COLUMN
2.6
1.8
4.6
1.1
0.4
Is it possible to round to the nearest 0.5, for example:
COLUMN
2.5
2
4.5
1
0.5
Preferably in a single SQL query?

Answer 1

You could consider the ROUND function.
As in
with t as (select 2.6 col from dual union all
select 1.8 from dual union all
select 4.6 from dual union all
select 1.1 from dual union all
select 10.4 from dual)
select col, round(col), round(col*2)/2 from t
Row#     COL     ROUND(COL)     ROUND(COL*2)/2
1     2,6     3     2,5
2     1,8     2     2
3     4,6     5     4,5
4     1,1     1     1
5     10,4     10     10,5