Question

从多个表中对MYSQL结果进行排序的方法是什么？

我有两张桌子。第一个：

＆＃34; store_products＆＃34;表：

+----+-----------+
| id | name      | 
+----+-----------+
|  1 | Product 1 |
|  2 | Product 2 |
|  3 | Product 3 |
+----+-----------+

这里我放置了产品名称。其他表格包含不同产品型号的价格：

＆＃34; store_products_variants＆＃34;表：

+-----+------------+-------------+-------------+
| id  | product_id | price_sale  | ordering    |
+-----+------------+-------------+-------------+
|  5  | 1          |  06.00      | 2           |
|  6  | 1          |  32.00      | 3           |
|  11 | 1          |  56.00      | 1           |
|  14 | 2          |  09.00      | 1           |
|  44 | 3          |  15.00      | 1           |
+-----+------------+-------------+-------------+

我需要创建一个价格（最低和最高）的排序，它只使用第一个变量 - 按列排序＆＃34;排序＆＃34;来自＆＃34; store_products_variants＆＃34;表

从上面的例子中，结果应该是：

+---+------------+---------------+
| 1 | Product 2  | (price 09.00) |
| 3 | Product 3  | (price 15.00) |
| 2 | Product 1  | (price 56.00) |
+---+------------+---------------+

这在MySQL中是否可行？

Answer 1

使用ordering列将正确的变体加入到产品中。

如果正确的ordering值始终为1，那么这将是查询。

SELECT 
    products.name,
    variants.price_sale
FROM store_products AS products
INNER JOIN store_products_variants AS variants
    ON variants.product_id = products.id 
    AND variants.ordering = 1
ORDER BY variants.price_sale ASC

此查询将首先查找产品的最低ordering值。然后用它来加入你的结果价格：

SELECT
    products.name,
    variants.price_sale
FROM
    store_products AS products
INNER JOIN (
    SELECT
        product_id,
        MIN(ordering) AS ordering
    FROM
        store_products_variants
    GROUP BY
        product_id
) AS variantOrdering
    ON variantOrdering.product_id = products.id
INNER JOIN store_products_variants AS variants 
    ON variants.product_id = variantOrdering.product_id
    AND variants.ordering = variantOrdering.ordering
ORDER BY 
    variants.price_sale ASC

Answer 2

select t.* from(
select t1.[id], t1.[name], 
'(price ' + cast(max(t2.[price_sale]) as varchar(50)) + ')' as [price]
from [#store_products] t1
left join [#store_products_variants] t2
on t1.[id] = t2.[]product_id
group by t1.[id], t1.[name]
)t
Order by len(t.[price]), t.[price];

Answer 3

是的，这是可能的。尝试使用JOIN命令，并在每个表的ID上加入。

Answer 4

您好，请使用此查询

Cursor.Position

我认为它会给你想要的结果

从MySQL中的多个表中对产品价格进行排序

4 个答案: