Question

将[docSVsys]加入[docSVsysReturn]会查询查询三个条件连接正在杀死它 - 它变成一个循环连接
这需要2分钟以上如果我取出或（[docSVsysReturn]。[sParID] = [coreCTE]。[sParID]和[docSVsysReturn]。[sParID] = [docSVsysReturn]。[sID]）它在1秒内运行我尝试了合并和散列连接，但不允许使用它们涉及的列被编入索引 [sID]是PK，[sParID]是必需的，FK是[sID]
有关如何修复性能的任何想法？

; WITH coreCTE AS (
  select [docSVsysAuth].[sID], [docSVsysAuth].[sParID]
    from [docSVsys] as [docSVsysAuth] with (nolock)
    join [docSVtext] as [Table] with (nolock)
      on [Table].[sID] = [docSVsysAuth].[sID]
     and [docSVsysAuth].[visibility] in (0)
     and [Table].[fieldID] = '108'
   where [table].[value]  = 'Andy Wipper<andy.wipper@company.com>' 
)  
,      [cteFinal] AS (
select distinct [docSVsysReturn].[sID], [docSVsysReturn].[sParID]
  from [coreCTE] 
  join [docSVsys] as [docSVsysReturn] with (nolock) 
    on ( [docSVsysReturn].[sID] = [coreCTE].[sID]
          or
         ( [docSVsysReturn].[sParID] = [coreCTE].[sParID] and [docSVsysReturn].[sParID] = [docSVsysReturn].[sID] )
       )
   and [docSVsysReturn].[visibility] in (0)
)
select [cteFinal].[sID], [cteFinal].[sParID] 
  from [cteFinal]
 order by [cteFinal].[sID], cteFinal.[sParID]

这有点帮助

on ( [docSVsysReturn].[sID] = [coreCTE].[sID]
      or
     ( [docSVsysReturn].[sID] <> [coreCTE].[sID] and [docSVsysReturn].[sParID] = [coreCTE].[sParID] and [docSVsysReturn].[sParID] = [docSVsysReturn].[sID] )
   )

Answer 1

我建议您尝试使用UNION编写查询。尝试一下。

select [docSVsysReturn].[sID], [docSVsysReturn].[sParID]
  from [coreCTE] 
  join [docSVsys] as [docSVsysReturn] with (nolock) 
    on [docSVsysReturn].[sID] = [coreCTE].[sID]
   and [docSVsysReturn].[visibility] in (0)

UNION

select [docSVsysReturn].[sID], [docSVsysReturn].[sParID]
  from [coreCTE] 
  join [docSVsys] as [docSVsysReturn] with (nolock) 
    on [docSVsysReturn].[sParID] = [coreCTE].[sParID] 
   and [docSVsysReturn].[sParID] = [docSVsysReturn].[sID]
   and [docSVsysReturn].[visibility] in (0)

Answer 2

从不同的角度来看，固定它基本上把OR放在游戏后面

; WITH coreCTE AS (
  select distinct [docSVsysAuth].[sID], [docSVsysAuth].[sParID]
  from [docSVsys] as [docSVsysAuth] with (nolock)
  join [docSVtext] as [Table] with (nolock)
  on [Table].[sID] = [docSVsysAuth].[sID]
  and [docSVsysAuth].[visibility] in (0)
  and [Table].[fieldID] = '108'
  where ((    [table].[value]  = 'Andy Wipper<andy.wipper@company.com>' )
  )
)
,      [cteFinal] AS (
select distinct [docSVsysReturn].[sID], [docSVsysReturn].[sParID]
  from [coreCTE] 
  join [docSVsys] as [docSVsysReturn] with (nolock) 
    on ( [docSVsysReturn].[sParID] = [coreCTE].[sParID]
         and
         (     [docSVsysReturn].[sID] = [coreCTE].[sID]  -- the document
           or  (      [docSVsysReturn].[sParID] = [docSVsysReturn].[sID] -- it is a parent
                  and [coreCTE].[sParID] <> [coreCTE].[sID] -- already have the parent
                  and [docSVsysReturn].[visibility] in (0)
               ) -- or the parent
         )
       )
)
select [cteFinal].[sID], [cteFinal].[sParID] -- ,bulkUpField 
  from [cteFinal]
 order by [cteFinal].[sID], cteFinal.[sParID]

在多个条件下缓慢加入

2 个答案: