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CREATE TABLE jan_product ( product_name varchar(10) ); CREATE TABLE feb_product ( product_name varchar(10) ); INSERT INTO jan_product VALUES ('A'), ('A'),('C'); INSERT INTO feb_product VALUES ('A'), ('B'),('C');
SELECT t.product_name , SUM( CASE WHEN t.month_number = 1 THEN 1 ELSE 0 END) AS jan_count , SUM( CASE WHEN t.month_number = 2 THEN 1 ELSE 0 END) AS feb_count FROM ( SELECT CAST(1 AS UNSIGNED) AS month_number, product_name FROM jan_product UNION ALL SELECT CAST(2 AS UNSIGNED) AS month_number, product_name FROM feb_product ) t GROUP BY t.product_name
product_name
jan_count
feb_count
A
2
1
C
1
1
B
0
1