我有这个查询来检索(见下文,为简单起见)搜索工作数据。我们正在处理大约一百万条记录。
Select ID
from
(
Select ID,createDate
,SearchKeyMatchRank
,Row_Number() over(Order By createDate) As rowNumber
from Jobs J
OUTER APPLY
(
Select SearchKeyMatchRank=
CASE WHEN @searchKey='""' THEN 0
ELSE
(Select IsNull([RANK],0) from FREETEXTTABLE(Jobs,title,@searchKey) Where [Key]=J.ID)*4
+(Select IsNull([RANK],0) from FREETEXTTABLE(Jobs,description,@searchKey) Where [Key]=J.ID)*4
+(
select SUM(ISNULL(JS2.[Rank],0))
from FREETEXTTABLE(JobSkills,skill,@searchKey) JS2
Where JS2.[Key] in (Select ID from JobSkills Where jobId=J.Id)
)*2
END
) SMR
Where
SearchKeyMatchRank>0 --simplified here
) T2
where
rowNumber>=CASE WHEN @startIndex>0 AND @endIndex>0 THEN @startIndex ELSE rowNumber END
AND rowNumber<=CASE WHEN @startIndex>0 AND @endIndex>0 THEN @endIndex ELSE rowNumber END
笔记:
我不能使用常规联接,因为我需要通过将 jobId 传递给 REETEXTTABLE 来找到加权等级。
问题:
它非常慢。
显然问题是比较计算列。
SearchKeyMatchRank>0
如果我起飞 Where SearchKeyMatchRank>0 它需要不到一秒钟。
有人知道我们如何改进这一点吗?