根據SQL Server中的字符串創建相關記錄

Question

我需要創建一個查詢，該查詢從表中獲取行，並將所有拆分字符串插入到相關表中。

例子：

在表Keywords我行：

Id Name 
1 RENAULT CLIO MTV 

，我需要創建一個查詢，取行和這樣的每個單詞創建1行：

在表中KeywordSearches：

Id: (Identity Increment) 
Name: RENAULT 
Keyword_Id: 1 

Id: (Identity Increment) 
Name: CLIO 
Keyword_Id: 1 

Id: (Identity Increment) 
Name: MTV 
Keyword_Id: 1 

I需要能夠基於表關鍵字的每一行創建所有相關的關鍵字搜索。

謝謝。獲得關鍵字列表

Answer 1

的一種方法是使用遞歸CTE：

with keywords as (
     select 1 as id, 'RENAULT CLIO MTV' as keywords union all 
     select 2 as id, 'A B' as keywords 
    ), 
    cte as (
     select id, 
      (case when keywords like '% %' 
        then left(keywords, charindex(' ', keywords)) 
        else keywords 
       end) as keyword, 
      (case when keywords like '% %' 
        then substring(keywords, charindex(' ', keywords)+1, 1000) 
        else '' 
       end) as rest 
     from keywords 
     union all 
     select id, 
      (case when rest like '% %' 
        then left(rest, charindex(' ', rest)) 
        else rest 
       end) as keyword, 
      (case when rest like '% %' 
        then substring(rest, charindex(' ', rest)+1, 1000) 
        else '' 
       end) as rest 
     from cte 
     where len(rest) > 0 
    ) 
select id, keyword 
from cte; 

使用相同的結構，你可以用insert替換最終select：

insert into KeywordSearches(name, keyword_id) 
    select keyword, id 
    from CTE; 

這是假設您已將id設置爲標識列。

這是第一個查詢的SQLFiddle。

編輯：

我認爲最終的查詢會是這樣的：

with cte as (
     select id, 
      (case when keywords like '% %' 
        then left(keywords, charindex(' ', keywords)) 
        else keywords 
       end) as keyword, 
      (case when keywords like '% %' 
        then substring(keywords, charindex(' ', keywords)+1, 1000) 
        else '' 
       end) as rest 
     from keywords 
     union all 
     select id, 
      (case when rest like '% %' 
        then left(rest, charindex(' ', rest)) 
        else rest 
       end) as keyword, 
      (case when rest like '% %' 
        then substring(rest, charindex(' ', rest)+1, 1000) 
        else '' 
       end) as rest 
     from cte 
     where len(rest) > 0 
    ) 
insert into KeywordSearches(name, keyword_id) 
    select keyword, id 
    from CTE;