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Developer-C 11.1
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-- У нас есть несколько коробок CREATE TABLE boxes ( id INT UNSIGNED NOT NULL, title VARCHAR(255) NOT NULL )
-- У нас есть несколько видов кубиков CREATE TABLE cubes ( id INT UNSIGNED NOT NULL, color VARCHAR(255) NOT NULL )
-- Кубики сложены в коробки, по несколько кубиков определенного типа CREATE TABLE cubes_in_boxes ( box_id INT UNSIGNED NOT NULL, cube_id INT UNSIGNED NOT NULL, cubes_count INT UNSIGNED NOT NULL )
INSERT INTO boxes(id, title) VALUES (1, 'first'), (2, 'second'), (3, 'third')
INSERT INTO cubes(id, color) VALUES (1, 'red'), (2, 'blue'), (3, 'green')
INSERT INTO cubes_in_boxes(box_id, cube_id, cubes_count) VALUES (3, 1, 43), (3, 2, 12), (2, 3, 5), (1, 1, 20), (3, 1, 17), (3, 3, 13), (2, 3, 21), (1, 2, 2), (3, 2, 19), (1, 1, 7) /** * 1 | red | 3 | 43 * 2 | blue | 3 | 12 * 3 | green | 2 | 5 * 4 | red | 1 | 20 * 5 | red | 3 | 17 * 6 | green | 3 | 13 * 7 | green | 2 | 21 * 8 | blue | 1 | 2 * 9 | blue | 3 | 19 * 10 | red | 1 | 7 **/
SELECT cib.box_id, -- Суммируем количество кубиков SUM(cib.cubes_count) AS cubes_count -- Получаем список кучек кубиков в коробках FROM cubes_in_boxes AS cib -- Нам нужно отфильтровать кучки по цвету -- Для этого добавляем информацию о цвете каждой кучки кубиков в коробке INNER JOIN cubes AS c ON c.id = cib.cube_id -- Оставляем только записи и кучках красных кубиков AND c.color = 'red' -- Группируем записи по коробкам GROUP BY cib.box_id
box_id
cubes_count
3
60
1
27