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CREATE TABLE t ([AdId] int, [UserID] varchar(1), [Watch Date] datetime) ; INSERT INTO t ([AdId], [UserID], [Watch Date]) VALUES (123, 'A', '2001-01-22 00:00:00'), (123, 'B', '2001-01-13 00:00:00'), (123, 'C', '2001-01-22 00:00:00'), (123, 'A', '2001-01-24 00:00:00'), (123, 'A', '2001-01-11 00:00:00'), (123, 'B', '2001-01-10 00:00:00'), (123, 'D', '2001-01-14 00:00:00'), (123, 'E', '2001-01-20 00:00:00') ;
8 rows affected
select max(AdId) as AdId ,cnt as '# of Times Watched' ,count(distinct UserID) as '# of Users' from ( select * ,count(*) over(partition by AdId, UserID) as cnt from t ) t group by cnt
AdId
# of Times Watched
# of Users
123
1
3
123
2
1
123
3
1