Counting Answers By day mySQL -


i have table called mytable.

with following fields

id date_done successful ('yes', 'no', null) total_cost

i know can per day count using

select date_done, count(*) mytable group date_done;

what want count of number of 'yes" andsers in successful day.

what sql like?

select date_done, sum(successful = 'yes') mytable group date_done

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