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select count(distinct userid), to_char(date_trunc('day', t."download_time"), 'YYYY-MM-DD') as download_day from ( values ('Rab01', '2020-04-29 03:28'::timestamp), ('Klm01', '2020-04-29 04:01'::timestamp), ('Klm01', '2020-04-30 05:10'::timestamp), ('Rab01', '2020-04-29 12:14'::timestamp), ('Osa_3', '2020-04-25 09:01'::timestamp) ) t (Userid, Download_Time) group by download_day ;
count
download_day
1
2020-04-25
2
2020-04-29
1
2020-04-30
SELECT 3