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CREATE TABLE test ( ID INT, user_id INT, createdAt DATE ); INSERT INTO test VALUES (1, 12, '2020-01-01'), (2, 12, '2020-01-03'), (3, 12, '2020-01-06'), (4, 13, '2020-01-02'), (5, 13, '2020-01-03');
SELECT MIN(DiffTable.diff) AS `MIN`, MAX(DiffTable.diff) AS `MAX`, SUM(DiffTable.diff) / COUNT(DISTINCT user_id) AS `AVG`, MIN(median.diff) FROM ( SELECT ID, user_id, DATEDIFF((SELECT t2.createdAt FROM test t2 WHERE t2.user_id = t1.user_id AND t1.createdAt <= t2.createdAt AND t2.id <> t1.id LIMIT 1), t1.createdAt) AS diff FROM test t1 ) DiffTable, ( SELECT m1.diff FROM ( SELECT ID, user_id, DATEDIFF((SELECT t2.createdAt FROM test t2 WHERE t2.user_id = t1.user_id AND t1.createdAt <= t2.createdAt AND t2.id <> t1.id LIMIT 1), t1.createdAt) AS diff FROM test t1 ) m1, ( SELECT ID, user_id, DATEDIFF((SELECT t2.createdAt FROM test t2 WHERE t2.user_id = t1.user_id AND t1.createdAt <= t2.createdAt AND t2.id <> t1.id LIMIT 1), t1.createdAt) AS diff FROM test t1 ) m2 WHERE m1.diff IS NOT NULL AND m2.diff IS NOT NULL GROUP BY m1.diff HAVING SUM(SIGN(1-SIGN(m1.diff-m2.diff))) = (COUNT(*)+1)/2 ) median WHERE DiffTable.diff IS NOT NULL
MIN
MAX
AVG
MIN(median.diff)
1
3
3.0000
2