仅提供具有特定阶段状态的产品的查询

Question

我有一个这样的表结构：

产品

Id_products
已接受

PRODUCTS_STAGES

Id_products_stages
姓名

PRODUCTS_STAGES

Id_products_stages
姓名

PRODUCTS_STATUSES

Id_products_状态
姓名
颜色

PRODUCTS_STAGES_SET

Id_products_stages_set
Id_products (fk)
Id_products_stages (fk)

PRODUCTS_STATUSES_SET

Id_products_statuses_set
Id_products_statuses (fk)
Id_products_stages_set (fk)

在PRODUCTS_STATUSES中有4种状态（Id-name）：

1 - 未开始
2 - 开始
3 - 未完成
4 - 完成

PRODUCTS_STAGES 有 6 个阶段。

我有这样的查询：

SELECT p.Id_products FROM PRODUCTS AS p 
INNER JOIN (SELECT pss.Id_products FROM PRODUCTS_STAGES_SET AS pss
                    INNER JOIN PRODUCTS_STATUSES_SET AS pss2 ON pss.Id_products_stages_set = pss2.Id_products_stages_set 
                    WHERE pss2.Id_products_statuses IN (1,2,3)
                    GROUP BY pss.Id_products) ps
ON p.Id_products = ps.Id_products

此查询为我提供了产品，其中 至少有一个 阶段 NOT 已完成

现在我想要一个查询，该查询仅提供具有特定阶段状态的产品。例如，我想要具有 stage2=Started

的产品

Answer 1

SELECT p.Id_products FROM PRODUCTS AS p 
INNER JOIN (SELECT pss.Id_products FROM PRODUCTS_STAGES_SET AS pss
                    INNER JOIN PRODUCTS_STATUSES_SET AS pss2 ON pss.Id_products_stages_set = pss2.Id_products_stages_set 
                    WHERE pss2.Id_products_statuses = 2
                    GROUP BY pss.Id_products) ps
ON p.Id_products = ps.Id_products

仅提供具有特定阶段状态的产品的查询

Query which gives products with only specific stages status

mysql

sql

subquery