Merge multiple rows in table setting one column based on value in rows

Question

I have some data that looks something like this:

key B
1   true
1   false
2   false
2   false

And I want to roll it up so that if column B has two false values then the resulting value for B is false; otherwise, if there is a true and false value the value for B is true. Like this:

key B
1   true
2   false

Is there a way that this can be done with (Snowflake) SQL? I first thought of a pivot table but this doesn't quite seem to be what pivots do.

Answer 1

According to your text if any of them are true is must be true, otherwise is false:

select
    key,
    case 
      when sum(case when B is true then 1 else 0 end) > 0 then true
      else false
    end as result
from
   t
group by
    key;

db<>fiddle here