嗨数据库专业人士。我需要你的帮助
这是我的数据库表
我想得到这个结果
如何编写选择查询以获得该结果?
我写了这个查询,但效果很慢(20分钟)
SELECT c.name, p.title, tbl1.count, tbl1.sum,tbl2.count_1, tbl2.sum_1, tbl3.count_2, tbl3.sum_2
FROM `client` c LEFT JOIN
(SELECT c.name, p.id, p.title,p.unit, o.client_id, COUNT(*) AS `count`, SUM(op.price) AS `sum`
FROM `order` o INNER JOIN order_product op ON o.id = op.order_id
INNER JOIN product p ON op.product_id = p.id
INNER JOIN `client` c ON c.id = o.client_id
WHERE MONTH(o.date) = MONTH('2013-07-01') AND YEAR(o.date) = YEAR('2013-07-01') AND p.category_id = 1
GROUP BY c.id, p.id, YEAR(o.date), MONTH(o.date)) AS tbl1 ON c.id = tbl1.client_id
LEFT JOIN
(SELECT p.id, p.title,p.unit, c.name, o.client_id, COUNT(*) AS `count_1`, SUM(op.price) AS `sum_1`
FROM `order` o INNER JOIN order_product op ON o.id = op.order_id
INNER JOIN product p ON op.product_id = p.id
INNER JOIN `client` c ON c.id = o.client_id
WHERE MONTH(o.date) = MONTH(DATE_ADD('2013-07-01', INTERVAL 1 MONTH)) AND
YEAR(o.date) = YEAR(DATE_ADD('2013-07-01', INTERVAL 1 MONTH)) AND p.category_id = 1
GROUP BY c.id, p.id, YEAR(o.date), MONTH(o.date)) AS tbl2 ON c.id = tbl2.client_id
LEFT JOIN
(SELECT p.id, p.title,p.unit, c.name, o.client_id, COUNT(*) AS `count_2`, SUM(op.price) AS `sum_2`
FROM `order` o INNER JOIN order_product op ON o.id = op.order_id
INNER JOIN product p ON op.product_id = p.id
INNER JOIN `client` c ON c.id = o.client_id
WHERE MONTH(o.date) = MONTH(DATE_ADD('2013-07-01', INTERVAL 2 MONTH)) AND
YEAR(o.date) = YEAR(DATE_ADD('2013-07-01', INTERVAL 2 MONTH)) AND p.category_id = 1
GROUP BY c.id, p.id, YEAR(o.date), MONTH(o.date)) AS tbl3 ON c.id = tbl3.client_id
, product p
WHERE (tbl1.id = p.id OR tbl2.id = p.id OR tbl3.id = p.id)
ORDER BY c.name