根据SQL Server中的字符串创建相关记录

Question

我需要创建一个查询，该查询从表中获取行，并将所有拆分字符串插入到相关表中。

例子：

在表Keywords我行：

Id Name 
1 RENAULT CLIO MTV 

，我需要创建一个查询，取行和这样的每个单词创建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需要能够基于表关键字的每一行创建所有相关的关键字搜索。

谢谢。获得关键字列表

Answer 1

的一种方法是使用递归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; 

使用相同的结构，你可以用insert替换最终select：

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

这是假设您已将id设置为标识列。

这是第一个查询的SQLFiddle。

编辑：

我认为最终的查询会是这样的：

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;