Question

我有一个查询，其中选择了所有销售的产品。我想要做的是反转查询并在一段时间内获得所有未售出的产品。

这是对一段时间内销售的所有产品的查询。

 SELECT 
    product.product_id, 
    product.product_brand_id, 
    product.product_model_id, 
    product.product_subcategory_id, 
    product.product_retail_price, 
    product.product_wholesale_price, 
    product.product_aretail_price, 
    product.product_awholesale_price, 
    product.product_oretail_price, 
    product.product_owholesale_price,  
    product.product_quoted_price, 
    product.product_aquoted_price, 
    product.product_dquoted_price, 
    product_sold.product_type, SUM(product_sold.product_quantity) AS product_quantity_sold, SUM(product_sold.product_total_price) AS total_price_sold
FROM product
INNER JOIN product_sold 
    ON product.product_id = product_sold.product_id 
    AND product.product_subcategory_id = '$subcategory_id'
INNER JOIN sales
    ON sales.sales_id = product_sold.product_sales_id 
WHERE sales.sales_approved = '1' 
    AND sales.sales_approved_time > '$start_timestamp' 
    AND sales.sales_approved_time < '$end_timestamp'
GROUP BY product_sold.product_type, product.product_id 
ORDER BY SUM(product_sold.product_quantity) DESC

有人可以指导我如何获得未售出的产品，我在这里没有任何想法。感谢。

解答：

                SELECT 
                    p.product_id, 
                    p.product_brand_id, 
                    p.product_model_id, 
                    p.product_subcategory_id, 
                    p.product_retail_price, 
                    p.product_wholesale_price, 
                    p.product_aretail_price, 
                    p.product_awholesale_price, 
                    p.product_oretail_price, 
                    p.product_owholesale_price, 
                    p.product_quoted_price, 
                    p.product_aquoted_price, 
                    p.product_dquoted_price,
                    pq.product_stock_type
                FROM 
                    product p
                LEFT JOIN 
                    product_sold ps 
                ON 
                    p.product_id = ps.product_id
                INNER JOIN
                    product_stock pq
                ON
                    p.product_id = pq.product_id
                AND 
                    pq.product_quantity > 0
                WHERE 
                    p.product_subcategory_id = '$subcategory_id'
                AND
                    ps.product_id IS NULL

Answer 1

通常，获取未包含在集合B中的集合A的成员的方法是使用左连接。我将从简化您的查询开始：

SELECT p.product_id, ps.product_id from product p
LEFT JOIN product_sold ps
WHERE ps.product_id IS NULL

这将返回product_sold中没有值的所有产品记录。您应该可以从那里添加详细信息。

Answer 2

试试这个：

SELECT 
    product.product_id
FROM product 
    LEFT JOIN
        (
            SELECT 
                product.product_id
            FROM product
            INNER JOIN product_sold 
                ON product.product_id = product_sold.product_id 
                AND product.product_subcategory_id = '$subcategory_id'
            INNER JOIN sales
                ON sales.sales_id = product_sold.product_sales_id 
            WHERE sales.sales_approved = '1' 
                AND sales.sales_approved_time > '$start_timestamp' 
                AND sales.sales_approved_time < '$end_timestamp'
            GROUP BY product_sold.product_type, product.product_id
        ) AS psold
            ON product.product_id = psold.product_id
WHERE psold.product_id IS NULL

这样，您有一个已售出产品的子请求，并且您将其与所有产品一起加入，WHERE子句仅选择第一个表中的产品（所有产品）而不选择第二个（已售出产品）中的产品。

使用什么类型的JOIN？ MySQL的

2 个答案: