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SELECT CAST(CreationDate AS DATE), COUNT(*) AS 'Number of users created', CASE WHEN CAST(CreationDate AS DATE) BETWEEN '2019-12-09' AND '2020-01-01' THEN 0 ELSE NULL END AS 'Winter Bash 2019' FROM Users WHERE CreationDate BETWEEN '2019-10-01' AND '2020-01-31' GROUP BY CAST(CreationDate AS DATE) ORDER BY CAST(CreationDate AS DATE)