子查詢爲單個列過濾返回了超過1個值錯誤

Question

我有兩列[2014席位]和[2015席位]，我只需要2015年6月份的值（不必介意列的名稱，值可以爲空），但其餘列需要在全年（2014年）進行。我嘗試了以下查詢，並且發現子查詢返回了超過1個值的錯誤。非常感謝您的幫助，謝謝！

select 
    [First Name], [Last Name], 
    (select [2014 Seats] 
    from dbo.Combined2 
    where [ReportMonth2] between '2015-06-01' and '2015-06-30') as Seats_2014, 
    (select [2015 Seats] 
    from dbo.Combined2 
    where [ReportMonth2] between '2015-06-01' and '2015-06-30') as Seats_2015 
from 
    dbo.Combined2 
where 
    Region = 'NAM' and 
    [FTE Status] = 'Active' and 
    [ReportMonth2] between '2014-01-01' and '2014-12-31' 

Answer 1

我不知道你在做什麼，但這裏是在黑暗中拍攝的照片。

select [First Name] 
    ,[Last Name] 
from dbo.Combined2 
cross apply 
(
    select [2014 Seats] 
    from dbo.Combined2 
    WHERE [ReportMonth2] between '2015-06-01' and '2015-06-30' 
)as Seats_2014 
cross apply 
(
    select [2015 Seats] 
    from dbo.Combined2 
    WHERE [ReportMonth2] between '2015-06-01' and '2015-06-30' 
)as Seats_2015 
where Region='NAM' 
    and [FTE Status]='Active' 
    and [ReportMonth2] between '2014-01-01' and '2014-12-31' 

Answer 2

在您通知我們查詢，這兩個subquerys獲得了大量的數值在單行列表，例如：

N° First Name Last Name Seats 2014 Seats 2015 1 John Paul All seats of John Paul All seats of John Paul 2 Paul John All seats of Paul John All seats of Paul John

這是你想要的嗎？

再次編輯：

select 
    [First Name], [Last Name], 
    Seats_2014 = STUFF((
         select ', ' + [2014 Seats] 
         from dbo.Combined2 
         where [ReportMonth2] between '2015-06-01' and '2015-06-30' 
         ORDER BY [2014 Seats] 
       FOR XML PATH('')), 1, 2, ''), 
    Seats_2015 = STUFF((
         select ', ' + [2015 Seats] 
         from dbo.Combined2 
         where [ReportMonth2] between '2015-06-01' and '2015-06-30' 
         ORDER BY [2015 Seats] 
       FOR XML PATH('')), 1, 2, '') 
from 
    dbo.Combined2 
where 
    Region = 'NAM' and 
    [FTE Status] = 'Active' and 
    [ReportMonth2] between '2014-01-01' and '2014-12-31' 

說明：

Seats_2014 = STUFF((
    -- Stuff is used to remove the first ', ' from the result 
         select N', ' + [2014 Seats] 
    -- N is the string declaration for nvarchar (used to prevent problems with strange characters) and ', ' come before each Seat 
         from dbo.Combined2 
         where [ReportMonth2] between '2015-06-01' and '2015-06-30' 
         ORDER BY [2014 Seats] 
       FOR XML PATH(N'')), 1, 2, N''), 
    --for xml path do the concatenation trick, the 1,2 is how many characters will be removed from tab (', '), in this casse one ',' and one ' ' and trade for N'' 

也看到，這條線是在2014年和2015年一樣，這是正確的？ where [ReportMonth2] between '2015-06-01' and '2015-06-30'