Question

Here is the result table images.I want to print out these available units using sum function.

1）查询1号

SELECT  SUM(inventory.inn-inventory.out_inv) AS available_units 
FROM  products
LEFT JOIN inventory on inventory.product_id=products.product_id
GROUP BY inventory.product_id

2）查询2号

 SELECT products.product_manual_id,products.product_name,products.product_description,products.product_unit,product_categories.category_name,products.product_image,price.cost ,price.selling_price  
FROM products,stores,product_taxes ,price,product_categories

WHERE (products.store_id=2  AND  product_taxes.tax_id=products.tax_id AND price.product_id=products.product_id OR product_categories.category_id=products.category_id) AND (products.product_id <=31 AND products.product_id >=29  ) 
GROUP By products.product_name ORDER BY products.product_name ASC

我想结合这两个问题＆＃39;结果。我该如何解决？我一直在尝试很多选择。无论谁给我答案，我都会感激。提前谢谢。

Answer 1

您可以使用product_id

两个选择表连接

    select t1.*, t2.* from ( 
    SELECT 
          products.product_id
        , SUM(inventory.inn - inventory.out_inv) AS available_units 
    FROM  products
    LEFT JOIN inventory on inventory.product_id=products.product_id
    GROUP BY inventory.product_id
    ) t1 
    left join (
     SELECT 
       products.product_manual_id
      ,products.product_id
      ,products.product_name
      ,products.product_description
      ,products.product_unit
      ,product_categories.category_name
      ,products.product_image
      ,price.cost 
      ,price.selling_price  
    FROM products,stores,product_taxes ,price,product_categories
    WHERE (products.store_id=2  
            AND  product_taxes.tax_id=products.tax_id 
            AND price.product_id=products.product_id 
            OR product_categories.category_id=products.category_id) 
    AND (products.product_id <=31 AND products.product_id >=29  ) 
    GROUP By products.product_name 

    ) t2 on t1.product_id = t2.product_id
    ORDER BY t2.product_name ASC

将两个查询组合成一个resluts

1 个答案: