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Developer-C 11.1
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CREATE TABLE IF NOT EXISTS `tbl_operations` ( `OpId` VARCHAR(100) NOT NULL, `OpDate` DATE NOT NULL ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 DEFAULT COLLATE=utf8mb4_unicode_ci; INSERT INTO `tbl_operations` (`OpId`, `OpDate`) VALUES ('3', '2022-01-03'), ('5,3', '2022-01-15'), ('4', '2022-01-27'), ('5', '2022-02-01'), ('7', '2022-02-09'), ('3,2', '2022-01-16');
WITH RECURSIVE norm AS ( SELECT OpId, OpDate FROM tbl_operations UNION ALL SELECT REGEXP_REPLACE(OpId, '^[^,]*,', '') OpId, OpDate FROM norm WHERE OpId LIKE '%,%' ) SELECT Id, Mo, COUNT(*) AS Cnt FROM ( SELECT REGEXP_REPLACE(norm.OpId, ',.*', '') AS Id, MONTH(norm.OpDate) AS Mo FROM norm ) formatted GROUP BY formatted.Id, formatted.Mo ORDER BY 2, 1
Id
Mo
Cnt
2
1
1
3
1
3
4
1
1
5
1
1
5
2
1
7
2
1