创建单个查询以从表中获取数据作为单独的行

Question

我在想是否有更好的方法可以从数据库中查询产品，产品选项和产品选项

我的数据库结构如下：

product table (product_id, product_name)
product_options table (option_id, option_name, product_id)
product_optionChoices (Choice_id, choice_name, Option_id)

我想要一个单独的查询，它会在单独的行中返回所有产品和选项，如：

--------------------------------------------------------------------------------
| product_id | product_name | option_id | option_name | choiceId | choice_name |
| 1          | shoes        |           |             |          |             |
| 1          |              | 1         | choose color|          |             |
|            |              | 1         |             | 1        | red         |
|            |              | 1         |             | 2        | blue        |
--------------------------------------------------------------------------------

现在我正在使用3个sepearte查询获取产品，产品选项和product_optionChoices，并在coldfusion中使用QueryAddRow将查询附加在一起。

由于

Answer 1

也许这个解决方案可以帮助你，即使我不喜欢它。
这将完全返回您想要的内容（更新）。

SELECT  p.product_id, p.product_name, '' as option_id, '' as option_name, ''  as choiceId, '' as choice_name FROM `product` p
UNION ALL
SELECT  pr.product_id as product_id, '' as product_name, o.option_id, o.option_name, '' as choiceId, '' as choice_name FROM `product_options` o
INNER JOIN product pr
ON pr.product_id = o.product_id
UNION ALL
SELECT  '' as product_id, '' as product_name, op.option_id as option_id, '' as option_name, c.choice_Id, c.choice_name FROM `product_optionChoices` c
INNER JOIN product_options op
ON op.option_id = c.option_id

Answer 2

这适用于SQL Server

SELECT P.product_id, P.product_name, PO.option_id, PO.option_name, POC.choiceId, POC.choice_name
FROM product P LEFT OUTER JOIN product_options PO on P.product_id = PO.product_id
               LEFT OUTER JOIN product_optionChoices POC on POC.option_id = PO.Option_id