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我正在尝试使用以下查询计算两列：

select distinct [District], 
  count (Distinct [Student Identifier Statewide California]) 
         as '11-12 Enrollment',
  (select count (Distinct IncdtKey) 
From [dbo].[DisciplineStudentFile1112]
where GrdLvLKey in ('15', '01', '02', '03', '04', 
                        '05', '06', '07', '08', '09', 
                        '10', '11', '12', '18', '19')) as Total_Incidents
From 
  dbo.SSID1112StudentEnrollmentRecords with (nolock)
inner join 
  [dbo].[SchoolDetail] on CDSCode = dbo.SSID1112StudentEnrollmentRecords.CDSOrig
where  
  [EnrollStatCodeOrig] like '10'
and 
  [Grade Level Code] in ('PS', 'KN', '01', '02', '03', 
                         '04', '05', '06', '07', '08', 
                         '09', '10', '11', '12', 'UE', 'US')
group by [District]
order by [District]

我的结果是：

District      11-12 Enrollment  Total_Incidents
AB Unified          20662                896371
CE Unified          5387                 896371
DR Unified          526                  896371
FJ Unified          1506                 896371
KT Unified          8415                 896371

我不知道如何获得Total_Incidents列中的单个计数而不是总计数 896371？

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1 回答 1

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一种简单的方法是将子查询与外部查询相关联：

select distinct SD.District,
  count ( distinct SER.[Student Identifier Statewide California] ) as [11-12 Enrollment],
  ( select count( distinct DSF.IncdtKey ) from dbo.DisciplineStudentFile1112 as DSF
    where DSF.GrdLvLKey in ( '15', '01', '02', '03', '04', '05', '06', '07', '08', '09', 
      '10', '11', '12', '18', '19' ) and -- Note additional condition here.
      DSF.District = SD.District ) as Total_Incidents
from dbo.SSID1112StudentEnrollmentRecords as SER with (nolock) inner join 
  dbo.SchoolDetail as SD on SD.CDSCode = SER.CDSOrig
where SER.EnrollStatCodeOrig like '10' and 
  [Grade Level Code] in ( 'PS', 'KN', '01', '02', '03', '04', '05', '06', '07', '08', 
  '09', '10', '11', '12', 'UE', 'US' )
group by SD.District
order by SD.District

我对表模式做了一些假设。我建议在使用连接时为每个表提供一个别名，并在每个引用上使用别名以避免混淆。

另一种解决方案是使用另一个连接，DisciplineStudentFile1112然后使用GROUP BY.

于 2013-04-06T00:16:58.987 回答