SQL搜索功能，通过外观列

Question

我已经建立了如下的SQL查询功能命令：

SELECT 
    * 
FROM 
    Table 
WHERE 
    Question LIKE @SearchString 
    OR Answer LIKE @SearchString 
    OR Keywords LIKE @SearchString 

而且我想通过相关命令他们，这意味着结果，其中的关键字，如@SearchString之上，接着是LIKE @SearchString，然后是LIKE @SearchString。但我似乎无法弄清楚，尽管有几个谷歌搜索的努力。

我发现的地方，

ORDER BY 
    CASE 
     WHEN CHARINDEX(FAQ_FAQ.Keywords, @SearchString, 1) > 0 THEN 0 
    ELSE 1 
END ASC, 

可能会奏效，但显然事实并非如此。

提前THX

Answer 1

SELECT 
    * 
FROM 
    Table 
WHERE 
    Keywords LIKE @SearchString 
    OR Answer LIKE @SearchString 
    OR Question LIKE @SearchString 
ORDER BY 
    CASE WHEN Keywords LIKE @SearchString THEN 0 
     WHEN Answer LIKE @SearchString THEN 1 
     ELSE 2 
    END 

Answer 2

你总是可以使用UNION ALL路线：

SELECT 
    * 
FROM 
    Table 
WHERE 
    Question LIKE @SearchString 

union all 

SELECT 
    * 
FROM 
    Table 
WHERE 
    Answer LIKE @SearchString 

union all 

SELECT 
    * 
FROM 
    Table 
WHERE 
    Keywords LIKE @SearchString 

你甚至可以把它尽可能的：

select * 
from 
(
    SELECT 
     *, 1 as OrderRank 
    FROM 
     Table 
    WHERE 
     Question LIKE @SearchString 

    union all 

    SELECT 
     *, 2 as OrderRank 
    FROM 
     Table 
    WHERE 
     Answer LIKE @SearchString 

    union all 

    SELECT 
     *, 3 as OrderRank 
    FROM 
     Table 
    WHERE 
     Keywords LIKE @SearchString 
)a 
order by OrderRank 

Answer 3

您可以选择三件事明显并将它们结合在一起，以获得您正在寻找的结果。可能有更好的方法，但我不知道它。你是否熟悉如何结合？

Answer 4

有这样的事情吗？

select * from (
    select 
     t.*, 
     case when Question LIKE @SearchString then 1 
      when Answer LIKE @SearchString then 2 
      when Keywords LIKE @SearchString then 3 
     end crit 
    from table t 
) where crit > 0 
order by crit