Count checked checkboxes within a query

Question

How do I count checked checkboxes within a query in Google sheets (this is part of a group query where I want to count checked checkboxes in column B for each value of column A grouped by column A)?

Answer 1

try:

=ARRAYFORMULA(QUERY({A:A\ B:B*1}; 
 "select Col1,sum(Col2) 
  where Col1 is not null 
  group by Col1 
  label sum(Col2)''"))