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如何从表中获取产品变体。如何为此应用 MySQL 查询

产品

+----+--------------+
| id | product_name |
+----+--------------+
|  1 | IPhone       |
+----+--------------+

product_variants

+----+------------+-----------------+
| id | product_id | product_variant |
+----+------------+-----------------+
|  1 |          1 | COLORS          |
|  2 |          1 | RAM             |
|  3 |          1 | STORAGE         |
+----+------------+-----------------+

product_variant_options

+----+------------+-----------------+
| id | variant_id | product_variant |
+----+------------+-----------------+
|  1 |          1 | BLUE            |
|  2 |          1 | GOLD            |
|  3 |          2 | 8GB             |
|  4 |          2 | 12GB            |
|  5 |          3 | 64GB            |
|  6 |          3 | 128GB           |
+----+------------+-----------------+

我想要这样的输出

输出

+----+------------+--------------+---------+------------+
| id | product_id | product_name | variant |  options   |
+----+------------+--------------+---------+------------+
|  1 |          1 | IPhone       | COLOR   | BLUE,GOLD  |
|  2 |          1 | IPhone       | RAM     | 8GB,12GB   |
|  3 |          1 | IPhone       | STORAGE | 64GB,128GB |
+----+------------+--------------+---------+------------+
4

2 回答 2

1

我没有要尝试的数据库数据，但这应该可以

 SELECT 
    products.id, product_variants.product_id, products.product_name,
    product_variants.product_variant,
    (SELECT GROUP_CONCAT(product_variant) FROM product_variant_options AS vo WHERE vo.variant_id = product_variants.id) AS options
 FROM
    products
    LEFT JOIN product_variants ON products.id = product_variants.product_id

只需加入 products 和 product_variants 表和 GROUP_CONCAT 选项

于 2021-01-31T14:14:36.830 回答
-1

我可以提供另一个没有子查询的解决方案：

select 
    pv.id id,
    p.id product_id, 
    product_name,
    pv.product_variant,
    group_concat(pvo.product_variant) variants
from products p
join product_variants pv on p.id = pv.product_id
join product_variant_options pvo on pvo.variant_id = pv.id
group by p.id, product_name, pv.id, pv.product_variant
;

分享 SQL 代码

结果：

+====+============+==============+=================+============+
| id | product_id | product_name | product_variant | variants   |
+====+============+==============+=================+============+
| 1  | 1          | IPhone       | COLORS          | BLUE,GOLD  |
+----+------------+--------------+-----------------+------------+
| 2  | 1          | IPhone       | RAM             | 8GB,12GB   |
+----+------------+--------------+-----------------+------------+
| 3  | 1          | IPhone       | STORAGE         | 64GB,128GB |
+----+------------+--------------+-----------------+------------+
于 2021-01-31T15:17:35.323 回答