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CREATE TABLE table_name ( id INT, client_id INT, created_at DATE ); INSERT INTO table_name VALUES (1, 1, '2019-07-01'), (2, 2, '2019-07-01'), (3, 1, '2019-08-01'), (4, 1, '2019-08-15'), (5, 1, '2019-09-01'), (6, 1, '2019-10-01'), (7, 1, '2019-11-01');
SELECT client_id FROM table_name WHERE created_at BETWEEN DATE_SUB(NOW(), INTERVAL 6 MONTH) AND NOW() GROUP BY client_id HAVING COUNT(DISTINCT CONCAT(YEAR(created_at), MONTH(created_at))) = (SELECT COUNT(DISTINCT CONCAT(YEAR(created_at), MONTH(created_at))) FROM table_name)
client_id
1