SQL - select row of group with lowest column value grouped by other

Question

Hy there,

I have this table

a	b	c
One	hello	1
two	hello	2
three	hi	3
four	hi	4

I want to select the minimum "C" value row grouping by B value

my output should be

a	b	c
One	hello	1
three	hi	3

How I could select them?

Answer 1

This is typically a solution for row_number

select a, b, c
from (
    select *, 
        Row_Number() over(partition by b order by c) rn
    from t
)t
where rn=1