Question : MYSQL Query Return Number Range

Is it possible to make a mysql query return a range of numbers?

Table1
Col1 || Col2
1      || 1
1      || 2
2      || 3
2      || 4
3      || 5

Result:
Col1 || Col2
1      || 1-2
2      || 3-4
3      || 5

Answer : MYSQL Query Return Number Range

from what I know, that is impossible to solve in mySQL with a single query.