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WITH users AS ( SELECT '2020-06-29' AS date, 352 AS uid UNION ALL SELECT '2020-06-29', 354 UNION ALL SELECT '2020-06-29', 354 UNION ALL SELECT '2020-06-30', 863 UNION ALL SELECT '2020-06-30', 352 UNION ALL SELECT '2020-06-30', 352 UNION ALL SELECT '2020-07-01', 358 UNION ALL SELECT '2020-07-01', 358 ) SELECT date, SUM(CASE WHEN NOT EXISTS (SELECT 1 FROM users u2 WHERE u2.date < u1.date AND u2.uid = u1.uid) THEN 1 ELSE 0 END) AS new_user_count FROM (SELECT DISTINCT date, uid FROM users) u1 GROUP BY date;
date
new_user_count
2020-06-29
2
2020-06-30
1
2020-07-01
1