Cumulative distinct count

Question

I am working on query to get cumulative distinct count of uids on daily basis.

Example : Say there are 2 uids (100,200) appeared on date 2016-11-01 and they also appea

Answer 1

easiest way:

SELECT *, count(*) over (order by fst_date ) cum_uids
  FROM (
SELECT uid, min(date) fst_date FROM t GROUP BY uid
 ) t

or something like this