sql - SQLite date group/sort issue -


i have id's timestamps d/m/y/t value linked each id. i'm looking add total value per day, multiple id's.

what have far 

select strftime('%y-%m-%d', event_time) valday, sum(purchase_cost_usd) iap group valday;

issue getting summed purchase_cost_usd, not per day, , no list.

all appreciated!

what have shown accumulated cost per day


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