过滤器加入，但仍然返回所有行

林不知道如何解释这一点。最好的我可以解释它是，我想做一个类似于左连接的东西，只有我想返回连接表的主表匹配条件的子集，但仍然返回所有左连接的行。我希望这是有道理的。过滤器加入，但仍然返回所有行

我有4个表：

公司

服务

ServicesTranslations

CompanyService

，公司可以有许多服务和服务可以有很多翻译。我想在ServiceTranslation表上筛选给定的搜索词。

我能得到这个工作的唯一方法是在SQL下面，但我觉得也许有更好的更干净的方法来做到这一点，或者我的解决方案好吗？

 DECLARE @defaultLanguage NVARCHAR(5) 

     SET @defaultLanguage = (SELECT LanguageCode FROM LANGUAGE WHERE IsDefault = 1) 

     SELECT 
      c.Id, 
      c.Name, 
      c.OrgNr, 
      c.UserId, 
      c.Address, 
      c.PostalArea, 
      c.County, 
      c.Country, 
      c.Description, 
      c.DescriptionFull, 
      c.Telephone, 
      c.Email, 
      c.Website, 
      c.IsApproved, 
      s.Id, 
      ISNULL(tr.Name, def.Name) Name 

      FROM Company c 

      INNER JOIN CompanyService cs on cs.CompanyId = C.Id 

      INNER JOIN Service s on s.Id = cs.ServiceId 

      LEFT OUTER JOIN ServiceTranslation tr 
      ON s.Id = tr.ServiceId AND tr.LanguageCode = @userLanguage 
      -- join default language of the service: 

      LEFT OUTER JOIN ServiceTranslation def 
      ON s.Id = def.ServiceId AND def.LanguageCode = @defaultLanguage 

      WHERE c.IsApproved = 1 

      AND 
      c.Id IN 
      (
       SELECT c1.Id FROM Company c1 

       INNER JOIN CompanyService cs1 on cs1.CompanyId = c1.Id 

       INNER JOIN Service s1 on s1.Id = cs1.ServiceId 

       INNER JOIN ServiceTranslation tr1 
       ON s1.Id = tr1.ServiceId AND tr1.LanguageCode = @userLanguage 
       -- join default language of the service: 

       INNER JOIN ServiceTranslation def1 
       ON s1.Id = def1.ServiceId AND def1.LanguageCode = @defaultLanguage 



       AND s1.IsApproved = 1 AND ISNULL(tr1.Name, def1.Name) LIKE '%' + @searchQuery + '%' 
     )

在此先感谢！

编辑：

我想一些澄清是必需的。我不知道如何以可读格式添加表格数据，所以我附上了表格和所需结果的一些图像。

Company表：

服务表：

ServiceTranslation表：

CompanyService表：

期望的结果（@userLanguage = 'NB-NO' 和@searchquery = '交通'）：

它有与所述字服务两家公司的运输'我想要这两家公司加上所有其他服务。

你可以从结果看图像，IM过滤器公司有一个匹配的服务，但还是想回到那些符合公司和所有服务。

我希望这使得它更有点清楚:)

来源

2017-08-16 JCoder23

我认为样本数据和预期的结果将真正帮助。你想要返回哪个子集？ –

您在主SELECT语句中的s.Id后缺少一个逗号，它包含c.Website，c.IsApproved，s.Id，ISNULL（tr.Name，def.Name）Name' –

@ J.D。对不起，这是一个错字，我现在修好了，谢谢。 – JCoder23

使用CTE：

;WITH Comps AS 
(
    SELECT DISTINCT c.CompanyId FROM CompanyService C 
    LEFT JOIN ServiceTranslation tr ON tr.ServiceId = C.ServiceId AND tr.LanguageCode = @userLanguage AND tr.Name LIKE '%' + @searchQuery + '%' 
    LEFT JOIN ServiceTranslation def ON def.ServiceId = C.ServiceId AND def.LanguageCode = @defaultLanguage AND def.Name LIKE '%' + @searchQuery + '%' 
    WHERE tr.ServiceId IS NOT NULL OR def.ServiceId IS NOT NULL 
) 

    SELECT 
     c.Id, 
     c.Name, 
     c.OrgNr, 
     c.UserId, 
     c.Address, 
     c.PostalArea, 
     c.County, 
     c.Country, 
     c.Description, 
     c.DescriptionFull, 
     c.Telephone, 
     c.Email, 
     c.Website, 
     c.IsApproved, 
     s.Id, 
     def.Name 

     FROM Company c 

     INNER JOIN CompanyService cs on cs.CompanyId = C.Id 

     INNER JOIN Service s on s.Id = cs.ServiceId 

     INNER JOIN ServiceTranslation def ON def.ServiceId = s.Id AND def.LanguageCode = @defaultLanguage 

     INNER JOIN Comps CM ON CM.CompanyId = c.Id 

     WHERE c.IsApproved = 1 AND s.IsApproved = 1

或使用子查询：

SELECT 
      c.Id, 
      c.Name, 
      c.OrgNr, 
      c.UserId, 
      c.Address, 
      c.PostalArea, 
      c.County, 
      c.Country, 
      c.Description, 
      c.DescriptionFull, 
      c.Telephone, 
      c.Email, 
      c.Website, 
      c.IsApproved, 
      s.Id, 
      def.Name 

      FROM Company c 

      INNER JOIN CompanyService cs on cs.CompanyId = C.Id 

      INNER JOIN Service s on s.Id = cs.ServiceId 

      INNER JOIN ServiceTranslation def ON def.ServiceId = s.Id AND def.LanguageCode = @defaultLanguage 

      INNER JOIN Comps CM ON CM.CompanyId = c.Id 

      WHERE c.IsApproved = 1 AND s.IsApproved = 1 AND c.Id IN 
      (
      SELECT DISTINCT c.CompanyId FROM CompanyService C 
      LEFT JOIN ServiceTranslation tr ON tr.ServiceId = C.ServiceId AND tr.LanguageCode = @userLanguage AND tr.Name LIKE '%' + @searchQuery + '%' 
      LEFT JOIN ServiceTranslation def ON def.ServiceId = C.ServiceId AND def.LanguageCode = @defaultLanguage AND def.Name LIKE '%' + @searchQuery + '%' 
      WHERE tr.ServiceId IS NOT NULL OR def.ServiceId IS NOT NULL 
     )

来源

2017-08-16 19:30:13

我已经尝试过，但只返回匹配搜索参数的公司和服务行。我已经添加了一些更详细的信息来解释后面的内容。谢谢 – JCoder23

感谢您的澄清。更新我提出的解决方案... –

非常感谢，我知道必须有一种更干净的方式来做到这一点！这非常有见地！ – JCoder23

过滤器加入，但仍然返回所有行

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