SQL 如何获取不包含产品的类别？答案

【问题标题】：SQL How to get categories that don't contain products?SQL 如何获取不包含产品的类别？
【发布时间】：2019-03-03 08:05:46
【问题描述】：

SELECT DISTINCT {c2.name} 
FROM 
    {BrandCategory AS c  
    JOIN CategoryProductRelation AS c2p  
    ON  {c.pk} = {c2p.source}  
    JOIN Product AS p  
    ON  {c2p.target} = {p.pk}  
    JOIN CategoryProductRelation AS c2p2  
    ON  {p.pk} = {c2p2.target}  
    JOIN TaxonomyCategory AS c2 ON {c2.pk} = {c2p2.source} 
    JOIN CatalogVersion AS cat 
    ON {c.catalogVersion} = {cat.PK}} 
WHERE 
    {c.code} = 'brand-MCH' 
    AND{cat.version} = 'Online' 
    AND {c2.code} NOT LIKE'%webFamily%' 
    AND {p.code} IN ('35365','34299')

上面的查询提取出包含产品“35365”和“34299”的分类分类

Result:
Passenger
Touring
All-Season
Truck

All Categories:
All-Season
Performance
Passenger
Winter
Touring
Summer
Truck
All-Terrain
Competition
Lawn

现在的要求是提取所有其他分类类别，即那些不包含产品“35365”和“34299”的类别

尝试 1：（失败）（未成功）

SELECT  DISTINCT {c2.name}
    FROM  {BrandCategory AS c
    JOIN  CategoryProductRelation AS c2p  ON {c.pk} = {c2p.source}
    JOIN  Product AS p  ON {c2p.target} = {p.pk}
    JOIN  CategoryProductRelation AS c2p2  ON {p.pk} = {c2p2.target}
    JOIN  TaxonomyCategory AS c2  ON {c2.pk} = {c2p2.source}
    JOIN  CatalogVersion AS cat  ON {c.catalogVersion} = {cat.PK}}
    WHERE  {c.code} = 'brand-MCH' AND{cat.version} = 'Online'
      AND  {c2.code} NOT LIKE'%webFamily%'
      AND  {p.code} NOT IN ('35365','34299')

尝试 2：（失败）（不存在）

SELECT  DISTINCT {c2.name}
    FROM  {BrandCategory AS c
    JOIN  CategoryProductRelation AS c2p  ON {c.pk} = {c2p.source}
    JOIN  Product AS p  ON {c2p.target} = {p.pk}
    JOIN  CategoryProductRelation AS c2p2  ON {p.pk} = {c2p2.target}
    JOIN  TaxonomyCategory AS c2  ON {c2.pk} = {c2p2.source}
    JOIN  CatalogVersion AS cat  ON {c.catalogVersion} = {cat.PK}}
    WHERE  {c.code} = 'brand-MCH' AND{cat.version} = 'Online'
      AND  {c2.code} NOT LIKE'%webFamily%'
      AND  {c2.code}
      AND  NOT EXISTS ({{
        SELECT  DISTINCT {c3.name}
            FROM  {BrandCategory AS c
            JOIN  CategoryProductRelation AS c2p  ON {c.pk} = {c2p.source}
            JOIN  Product AS p  ON {c2p.target} = {p.pk}
            JOIN  CategoryProductRelation AS c2p2  ON {p.pk} = {c2p2.target}
            JOIN  TaxonomyCategory AS c3  ON {c3.pk} = {c2p2.source}
            JOIN  CatalogVersion AS cat  ON {c.catalogVersion} = {cat.PK}}
            WHERE  {c3.name}={c2.name}
              AND  {c.code} = 'brand-MCH' AND{cat.version} = 'Online'
              AND  {c3.code} NOT LIKE'%webFamily%'
              AND  {p.code} IN ('35365','34299')}}
                      )

尝试 3：（失败）（不在子查询中）

SELECT  DISTINCT {c2.name}
    FROM  {BrandCategory AS c
    JOIN  CategoryProductRelation AS c2p  ON {c.pk} = {c2p.source}
    JOIN  Product AS p  ON {c2p.target} = {p.pk}
    JOIN  CategoryProductRelation AS c2p2  ON {p.pk} = {c2p2.target}
    JOIN  TaxonomyCategory AS c2  ON {c2.pk} = {c2p2.source}
    JOIN  CatalogVersion AS cat  ON {c.catalogVersion} = {cat.PK}}
    WHERE  {c.code} = 'brand-MCH' AND{cat.version} = 'Online'
      AND  {c2.code} NOT LIKE'%webFamily%'
      AND  {c2.name} NOT IN ({{
        SELECT  DISTINCT {c2.name}
            FROM  {BrandCategory AS c
            JOIN  CategoryProductRelation AS c2p  ON {c.pk} = {c2p.source}
            JOIN  Product AS p  ON {c2p.target} = {p.pk}
            JOIN  CategoryProductRelation AS c2p2  ON {p.pk} = {c2p2.target}
            JOIN  TaxonomyCategory AS c2  ON {c2.pk} = {c2p2.source}
            JOIN  CatalogVersion AS cat  ON {c.catalogVersion} = {cat.PK}}
            WHERE  {c.code} = 'brand-MCH' AND{cat.version} = 'Online'
              AND  {c2.code} NOT LIKE'%webFamily%'
              AND  {p.code} IN ('35365','34299')}}
                          )

...

Result:
All-Season
Performance
Passenger
Winter
Touring
Summer
Truck
All-Terrain
Competition
Lawn

Expected:
Performance
Winter
Summer
All-Terrain
Competition
Lawn

请帮助获取那些不包含的类别，并通过最佳查询来控制性能。

此外，如果有一种方法可以让所有类别在结果中带有一些标志来区分哪些产品包含真实与否，那将是绝对的黄金，因为在这里我们点击 DB 两次以获取包含的类别，然后获取包含的类别不通过按需调用包含

注意：这些本质上是 SQL 查询，只是稍微修改了这些大括号以支持 Hybris 框架中的灵活搜索查询格式

【问题讨论】：

首先站点一个包含和一个不包含看起来像给我所有。您可以通过以文本形式提供示例数据和预期输出来改进此问题。
stackoverflow.com/questions/5748620/sql-server-not-in
您应该尝试将整个第一个查询放在“not in”子句中。 SELECT DISTINCT {name} FROM CategoryProductRelation where name not in（您的第一个查询）
请格式化您的代码，使其不会全部在一行中。
谢谢@Tuckbros 现在我有两个版本的查询，一个与 NOT IN 一起工作，一个与 NOT EXISTS 一起工作。 NOT EXISTS 的性能效率更高，但由于它是同一张表，我们不需要是吗？

标签： mysql sql-server performance query-performance inverse

【解决方案1】：

查询-
1. 使用 NOT IN-
SELECT {c.code} FROM {Product as p join CategoryProductRelation as c2p on {c2p.target} = {p.pk} join Category as c on {c2p.source} = {c.pk}} WHERE {p.code} NOT IN ('35365','34299')

使用不存在-
SELECT {c.code} FROM {CategoryProductRelation as c2p join Category as c on {c2p.source} = {c.pk}} WHERE NOT EXISTS ({{SELECT {p.code} FROM {Product as p} WHERE {p.code} IN ('35365','34299') and {c2p.target}={p.pk}}})
使用子查询-
SELECT {c.code} FROM {Product as p join CategoryProductRelation as c2p on {c2p.target} = {p.pk} join Category as c on {c2p.source} = {c.pk}} WHERE {p.pk} IN ({{SELECT {pk} FROM {Product} WHERE {code} IN ('35365','34299')}})

【讨论】：

【解决方案2】：

首先查看NOT EXISTS 和NOT IN 是否给出了正确的值。

对于EXISTS，不要打扰DISTINCT，也不要指定列。这足够了：

NOT EXISTS ( SELECT 1 FROM ... )

删除所有与问题无关的JOIN。这样可以更轻松地查看问题所在。

什么是大括号？也许您应该删除[mysql] 标签？

【讨论】：