Question

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

我无法弄清楚如何获取Total_Incidents列中的个别计数而不是总计896371计数？

Answer 1

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DisciplineStudentFile1112的其他联接，然后使用GROUP BY汇总结果。

三个表中有两个计数

1 个答案: