Sql类目商品数量查询

Question

你好，我有一个问题，如果有人能帮忙就太好了

我想做的是按所选类别获取所有计数。例如，如果我没有选择任何类别，结果将是这样的：

Category-70 ( 2 ) <- Product-57, Product-56
Category-64 ( 2 ) <- Product-57, Product-50
Category-61 ( 1 ) <- Product-56
Category-73 ( 1 ) <- Product-50

这很简单。我有一个这样的查询：

http://sqlfiddle.com/#!9/4f188/1

所以我想将类别 ID 传递给我的查询，并根据此 ID 获取计数，如果我传递类别 ID 70，则结果必须是

Category-70 ( 2 ) <- Product-57, Product-56
Category-64 ( 1 ) <- Product-57, [Product-50 is gone because is not in cateogry id 70]
Category-61 ( 0 )
Category-73 ( 0 )

如果我传递类别 ID 70 和 64，结果必须是

Category-70 ( 1 ) <- Product-57, [Product-56 is gone because is not in category 70 and 64]
Category-64 ( 1 ) <- Product-57
Category-61 ( 0 ) [Product-56 is gone, because is not in category 70 and 64 ]
Category-73 ( 0 ) [Product-50 is gone because is not in category 70 and 64]

或者如果我给出参数类别 id 73，结果必须是

Category-70 ( 0 ) [products are not counted because they are not in 73]
Category-64 ( 1 ) <- Product-50
Category-61 ( 0 ) [products are not counted because they are not in 73]
Category-73 ( 1 ) <- Product-50

这有可能吗:)，请帮忙...

Answer 1

+1 用于 SQL fiddle 示例，非常有用。

我相信这应该可以解决您的问题（在您的加入中添加了子 select）

SELECT Concat('Category-',c.category_id), 
count(DISTINCT p2c.product_id) as products 
FROM category c 
LEFT JOIN product_to_category p2c 
  ON (c.category_id = p2c.category_id AND p2c.product_id) AND p2c.product_id in
  (select product_id from product_to_category where category_id = @input)
LEFT JOIN category_path cp ON (cp.category_id = c.category_id AND cp.path_id = c.category_id)    
WHERE
cp.level <= 2 
GROUP BY c.category_id
ORDER BY c.sort_order

Sql类目商品数量查询

Sql categories products count query

mysql

sql

product

count

categories