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CREATE TABLE tableA ( `id` int, `date` date, `tableB_id` int ); INSERT INTO tableA (`id`, `date`, `tableB_id`) VALUES ('1', '2020-10-02' , '2'), ('1' , '2020-10-19' , '2'), ('1' , '2020-10-21' , '1'), ('1' , '2020-11-02' , '3'), ('1' , '2020-11-11', '1'); CREATE TABLE tableB ( `id` int, `name` varchar(19) ); INSERT INTO tableB (`id`, `name`) VALUES ('1', 'lorem'), ('2', 'ipsum'), ('3', 'dolor');
SELECT b.`name`, Count(`tableB_id`) FROM tableB b LEFT JOIN (SELECT * FROM tableA WHERE MONTH(`date`) = '10') a ON a.tableB_id = b.id GROUP BY b.name ;
name
Count(`tableB_id`)
lorem
1
ipsum
2
dolor
0