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create table product ( id int, name varchar(10), description varchar(50), stock int ); insert into product values (1, 'product1', 'first product', 5), (2, 'product2', 'second product', 5); create table product_additional ( id int, fieldname varchar(10), fieldvalue varchar(10) ); insert into product_additional values (1, 'size', 'S'), (1, 'height', '103'), (2, 'size', 'L'), (2, 'height', '13'), (2, 'color', 'black'), (2, '(colorx-1)', 'blackx'), (3, '-colorx1', 'blackx1');
SET @sql = NULL; SELECT GROUP_CONCAT(DISTINCT CONCAT( 'MAX(IF(pa.fieldname = ''', fieldname, ''', pa.fieldvalue, NULL)) AS ', fieldname ) ) INTO @sql FROM product_additional; SET @sql = CONCAT('SELECT p.id , p.name , p.description, ', @sql, ' FROM product p LEFT JOIN product_additional AS pa ON p.id = pa.id GROUP BY p.id'); PREPARE stmt FROM @sql; EXECUTE stmt; DEALLOCATE PREPARE stmt;