SQL & PL/SQL

Hi,

Need to orderby two separate columns in ascending.

Actually am populating values to an excel sheet from oracle which requires two specific columns to be sorted individually.

select * from abc
order by col1, col2;

Actually the output of the above query will be

col1 col2
1 5
2 6
3 1
4 2

but I want as shown below.

col1 col2
1 1
2 2
3 5
4 6

I need to bring in Oracle the similar feature we have in excel under 'Data' -> 'Sort' -> col1 then by -> col2.

Could anybody suggest me the best way .. Appreciate your response

Thanks