SQL to determine minimum sequential days of access?

Question

The following User History table contains one record for every day a given user has accessed a website (in a 24 hour UTC period). It has many thousands of r

Answer 1

Spencer almost did it, but this should be the working code:

SELECT DISTINCT UserId
FROM History h1
WHERE (
    SELECT COUNT(*) 
    FROM History
    WHERE UserId = h1.UserId AND CreationDate BETWEEN h1.CreationDate AND DATEADD(d, @n-1, h1.CreationDate)
) >= @n