Question

在ms sql 2012服务器中，我有几列的全文搜索索引我使用FREETEXTTABLE或CONTAINSTABLE进行查询，如果搜索文本出现在多个列而不是其他列上，我的反应会有所不同。
有没有办法区分或接收结果显示的列名？
感谢。

Answer 1

我假设您使用*选项调用FREETEXTTABLE / CONTAINSTABLE来搜索所有列。相反，尝试进行多次调用，每列一次。您可以在1个查询中执行此操作，也可以根据具体情况单独查询。

例如（1查询方法）：

SELECT
   Case
      When (MatchesColumn1or2.[KEY] is not null) Then 'Matches Column 1 or 2'
      When (MatchesColumn3.[KEY] is not null) Then 'Matches Column 3'
   End
FROM
   FREETEXTTABLE(MyTable, (Column1, Column2), 'cat AND dog') as MatchesColumn1or2
full outer join
   FREETEXTTABLE(MyTable, Column3, 'cat AND dog') as MatchesColumn3
   on (MatchesColumn1or2.[KEY] = MatchesColumn3.[KEY])

以下是一个示例，如果您想保留原始排名值，但要注意增加的性能影响：

SELECT
   MatchAllColumns.[RANK],
   Case
      When (MatchesColumn1or2.[KEY] is not null) Then 'Matches Column 1 or 2'
      When (MatchesColumn3.[KEY] is not null) Then 'Matches Column 3'
   End
FROM
   FREETEXTTABLE(MyTable, *, 'cat AND dog') as MatchAllColumns
left join
   FREETEXTTABLE(MyTable, (Column1, Column2), 'cat AND dog') as MatchesColumn1or2
   on (MatchAllColumns.[KEY] = MatchesColumn1or2.[KEY])
left join
   FREETEXTTABLE(MyTable, Column3, 'cat AND dog') as MatchesColumn3
   on (MatchAllColumns.[KEY] = MatchesColumn3.[KEY])

全文搜索 - 有没有办法获取导致查询行的列名

1 个答案: