過濾器加入，但仍然返回所有行

林不知道如何解釋這一點。最好的我可以解釋它是，我想做一個類似於左連接的東西，只有我想返回連接表的主表匹配條件的子集，但仍然返回所有左連接的行。我希望這是有道理的。過濾器加入，但仍然返回所有行

我有4個表：

公司

服務

ServicesTranslations

CompanyService

，公司可以有許多服務和服務可以有很多翻譯。我想在ServiceTranslation表上篩選給定的搜索詞。

我能得到這個工作的唯一方法是在SQL下面，但我覺得也許有更好的更乾淨的方法來做到這一點，或者我的解決方案好嗎？

 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 + '%' 
     )

在此先感謝！

編輯：

我想一些澄清是必需的。我不知道如何以可讀格式添加表格數據，所以我附上了表格和所需結果的一些圖像。

Company表：

服務表：

ServiceTranslation表：

CompanyService表：

期望的結果（@userLanguage = 'NB-NO' 和@searchquery = '交通'）：

它有與所述字服務兩家公司的運輸'我想要這兩家公司加上所有其他服務。

你可以從結果看圖像，IM過濾器公司有一個匹配的服務，但還是想回到那些符合公司和所有服務。

我希望這使得它更有點清楚:)

來源

2017-08-16 JCoder23

我認爲樣本數據和預期的結果將真正幫助。你想要返回哪個子集？ –

您在主SELECT語句中的s.Id後缺少一個逗號，它包含c.Website，c.IsApproved，s.Id，ISNULL（tr.Name，def.Name）Name' –

@ J.D。對不起，這是一個錯字，我現在修好了，謝謝。 – 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

或使用子查詢：

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 
     )

來源

2017-08-16 19:30:13

我已經嘗試過，但只返回匹配搜索參數的公司和服務行。我已經添加了一些更詳細的信息來解釋後面的內容。謝謝 – JCoder23

感謝您的澄清。更新我提出的解決方案... –

非常感謝，我知道必須有一種更乾淨的方式來做到這一點！這非常有見地！ – JCoder23

過濾器加入，但仍然返回所有行

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