Question

我写了这个查询它工作正常但是当我向它添加group by Date时，它会返回一个错误：

子查询返回超过1等

我的代码：

Declare @FromDate datetime set @FromDate='2014-11-01 09:01:11.927'
Declare @ToDate datetime set @ToDate='2014-11-06 05:01:11.927'
Declare @Day int

Set @Day= (Select Count(*) from Attendance where 
  AttendanceDate >= @FromDate AND AttendanceDate < dateadd(day,1, @ToDate )
  AND Attendance.DepartmentShiftHistory_ID=47
  and organization_id=40 
  group by Attendance.DepartmentShiftHistory_ID,cast(AttendanceDate as date),User_ID
  )

  print @Day

Answer 1

当您执行原始查询（没有分组）时，它会返回一个类似1337的数字。按日期对其进行分组时，它将返回与原始数字（1000,300,30,7）相加的数字，并且您无法为变量分配该数字。

如果您希望获得总天数，请按部分离开。

如果您希望获得每天的结果，则应将其插入临时表（如

）

Select AttendanceDate, Count(*) 
from Attendance 
into #Days
where AttendanceDate >= @FromDate AND AttendanceDate < dateadd(day,1, @ToDate )
AND Attendance.DepartmentShiftHistory_ID=47
and organization_id=40 
group by Attendance.DepartmentShiftHistory_ID,cast(AttendanceDate as date),User_ID

SELECT * FROM #Days

Answer 2

试试这个

Declare @FromDate datetime set @FromDate='2014-11-01 09:01:11.927'
Declare @ToDate datetime set @ToDate='2014-11-06 05:01:11.927'
Declare @Day int

Set @Day= (Select top 1 Count(*) OVER ()  from Attendance where 
  AttendanceDate >= @FromDate AND AttendanceDate < dateadd(day,1, @ToDate )
  AND Attendance.DepartmentShiftHistory_ID=47
  and organization_id=40 
  group by Attendance.DepartmentShiftHistory_ID,cast(AttendanceDate as date),User_ID
  )

  print @Day

此处我另外使用 - top 1 Count（*）OVER（），即用于获取“按语句分组返回的记录数”

Answer 3

感谢回复，但没有一个解决方案适合我，所以我尝试了这个并且工作

set @Day=(select count(*) from (Select  count(*) 'is' from Attendance where 
        AttendanceDate >= @FromDate AND AttendanceDate < dateadd(day,1, @ToDate )
        AND Attendance.DepartmentShiftHistory_ID=@DepartmentShiftHistory_ID
        and organization_id=@OrgID
        group by Attendance.DepartmentShiftHistory_ID,cast(AttendanceDate as date)
        ) as c)

为什么日期列不能与group by一起使用，返回错误Subquery返回的值超过1

3 个答案: