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WITH yourTable AS ( SELECT 'a' AS uid, '2020-12-31' AS data_date UNION ALL SELECT 'a', '2021-01-01' UNION ALL SELECT 'a', '2021-01-05' UNION ALL SELECT 'b', '2021-03-02' UNION ALL SELECT 'b', '2021-03-05' UNION ALL SELECT 'b', '2021-03-07' ) SELECT uid, DATEDIFF(data_date, (SELECT t2.data_date FROM yourTable t2 WHERE t2.uid = t1.uid AND t2.data_date < t1.data_date ORDER BY t2.data_date DESC LIMIT 1)) AS date_diff FROM yourTable t1 HAVING date_diff IS NOT NULL ORDER BY uid, data_date;
uid
date_diff
a
1
a
4
b
3
b
2