SQL Server：字符串操作來寫出搜索引擎優化友好標題

Question

我需要按照一些規則給我寫一個SEO朋友格式的歌曲標題。

最大lentgh是52個字符。目前截斷髮生在以CL開始的記錄上，並且與一組關聯ID有關。

額外的規則我要申請是：

• 如果seo_friendly_title以結束「 - 」將其刪除。
• 如果 截斷在單詞或空格的中間結束，則移至下一空格（下一個單詞的結尾） 。

我想我必須添加嵌套的CASE語句才能完成此操作，但我不知道在哪裏添加這個新檢查。

我想請求你幫忙完成這個算法，希望有人可以分享他們的經驗，並展示/解釋如何做到這一點。

非常感謝。

這裏是我當前的SQL查詢：

SELECT 
    [sfwt].[seo_friendly_title] 
, CASE  
     WHEN [sfwt].[pf_id] LIKE 'CL%' AND [pd].[AssociationID] IN (1, 3, 4) THEN 
      LEFT([sfwt].[seo_friendly_title], 52) 
    END [seo_final_title] 
FROM 
    [dbo].[SEOFriendly_WorkingTable] [sfwt] 
INNER JOIN [dbo].[ProductData] [pd] 
    ON [pd].[ProductID] = [sfwt].[pf_id] 
WHERE [sfwt].[pf_id] LIKE 'CL%' 
ORDER BY  
    [sfwt].[pf_id]; 

和輸出：

seo_friendly_title seo_final_title 
prelude-no-5-for-trumpet-and-piano-johann-sebastian-bach prelude-no-5-for-trumpet-and-piano-johann-sebastian- 
prelude-no-8-for-trumpet-and-piano-johann-sebastian-bach prelude-no-8-for-trumpet-and-piano-johann-sebastian- 
highlights-from-the-lord-of-the-rings-the-return-of-the-king highlights-from-the-lord-of-the-rings-the-return-of- 
air-ecossais-spirituoso-e-marciale-opus-107-no-10-f-instrument-piano air-ecossais-spirituoso-e-marciale-opus-107-no-10-f- 
air-ecossais-spirituoso-e-marciale-opus-107-no-10-c-instrument-piano air-ecossais-spirituoso-e-marciale-opus-107-no-10-c- 
air-de-la-petite-russie-opus-107-no-3-bb-instrument-piano air-de-la-petite-russie-opus-107-no-3-bb-instrument- 
air-de-la-petite-russie-opus-107-no-3-eb-instrument-piano air-de-la-petite-russie-opus-107-no-3-eb-instrument- 
shell-be-coming-round-the-mountain-c-instrument-and-piano shell-be-coming-round-the-mountain-c-instrument-and- 
shell-be-coming-round-the-mountain-f-instrument-and-piano shell-be-coming-round-the-mountain-f-instrument-and- 
9-ecossaises-from-38-waltzer-landler-und-ecossaisen-op-18 9-ecossaises-from-38-waltzer-landler-und-ecossaisen- 

Answer 1

在這裏，你去。更新09/27

SELECT 
    [sfwt].[seo_friendly_title] 
, CASE  
     WHEN [sfwt].[pf_id] LIKE 'CL%' AND [pd].[AssociationID] IN (1, 3, 4) and LEFT([sfwt].[seo_friendly_title], 52) LIKE '%-' THEN LEFT([sfwt].[seo_friendly_title], 51) 
     WHEN [sfwt].[pf_id] LIKE 'CL%' AND [pd].[AssociationID] IN (1, 3, 4) THEN LEFT([sfwt].[seo_friendly_title], 52) 
     WHEN [sfwt].[pf_id] LIKE 'CL%' AND [pd].[AssociationID] IN (1, 3, 4) and LEFT([sfwt].[seo_friendly_title], 52) NOT like '%-' 
      and left(Replace([sfwt].[seo_friendly_title],LEFT([sfwt].[seo_friendly_title], 52),''),1) <> '-' 
      and Charindex('-',Replace([sfwt].[seo_friendly_title],LEFT([sfwt].[seo_friendly_title], 52),'') = 0 then [sfwt].[seo_friendly_title] 
     WHEN [sfwt].[pf_id] LIKE 'CL%' AND [pd].[AssociationID] IN (1, 3, 4) and LEFT([sfwt].[seo_friendly_title], 52) NOT like '%-' 
      and left(Replace([sfwt].[seo_friendly_title],LEFT([sfwt].[seo_friendly_title], 52),''),1) <> '-' 
      and Charindex('-',Replace([sfwt].[seo_friendly_title],LEFT([sfwt].[seo_friendly_title], 52),'') != 0 then LEFT([sfwt].[seo_friendly_title], 51 + Charindex('-',Replace([sfwt].[seo_friendly_title],LEFT([sfwt].[seo_friendly_title], 52),''))) 
    END [seo_final_title] 
FROM 
    [dbo].[SEOFriendly_WorkingTable] [sfwt] 
INNER JOIN [dbo].[ProductData] [pd] 
    ON [pd].[ProductID] = [sfwt].[pf_id] 
WHERE [sfwt].[pf_id] LIKE 'CL%' 
ORDER BY  
    [sfwt].[pf_id]; 

Answer 2

你可以試試這個爲1點，但我不明白的點數其中兩個是「如果截斷在單詞或空格的中間結束，然後移到下一個空格（下一個單詞的結尾）。「你能分享一下這個例子嗎？

SELECT 
    [sfwt].[seo_friendly_title] 
, CASE  
     WHEN [sfwt].[pf_id] LIKE 'CL%' AND [pd].[AssociationID] IN (1, 3, 4) and LEFT([sfwt].[seo_friendly_title], 52) LIKE '%-' THEN LEFT([sfwt].[seo_friendly_title], 51) 
     WHEN [sfwt].[pf_id] LIKE 'CL%' AND [pd].[AssociationID] IN (1, 3, 4) THEN LEFT([sfwt].[seo_friendly_title], 52) 
    END [seo_final_title] 
FROM 
    [dbo].[SEOFriendly_WorkingTable] [sfwt] 
INNER JOIN [dbo].[ProductData] [pd] 
    ON [pd].[ProductID] = [sfwt].[pf_id] 
WHERE [sfwt].[pf_id] LIKE 'CL%' 
ORDER BY  
    [sfwt].[pf_id];