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CREATE TABLE table2 (`id` INTEGER, `table1_id` INTEGER, `price` INTEGER, `created_at` DATETIME); INSERT INTO table2 (`id`, `table1_id`, `price`, `created_at`) VALUES ('1', '11', '10', '2020-11-19'), ('2', '11', '12', '2020-11-20'), ('3', '11', '14', '2020-11-21'), ('4', '11', '16', '2020-11-22'), ('2', '12', '10', '2020-11-16'), ('3', '12', '12', '2020-11-17'), ('4', '12', '14', '2020-11-18'), ('2', '13', '16', '2020-11-19'), ('3', '13', '18', '2020-11-20'), ('4', '13', '20', '2020-11-21'), ('2', '13', '22', '2020-11-22'), ('2', '14', '10', '2020-11-17'), ('3', '14', '12', '2020-11-18'), ('4', '14', '14', '2020-11-19'), ('2', '14', '16', '2020-11-20'), ('3', '14', '18', '2020-11-21'), ('4', '14', '20', '2020-11-22');
SELECT table1_id, AVG(price) avg_price FROM ( SELECT *, ROW_NUMBER() OVER (PARTITION BY table1_id ORDER BY created_at DESC) rn FROM table2 ) t WHERE rn <= 2 GROUP BY table1_id
table1_id
avg_price
11
15.0000
12
13.0000
13
21.0000
14
19.0000