子查询时只能指定表达式…SQL Server

Question

So, I've been working on a loop to get data from each day going back 211 days for a report. And I'm getting this error message. I'm using SQL Server 2008 R2, and although I don't know why I get this error, I've tried some different things that haven't worked. So I'm asking here really thankful for answers.

Msg 116, Level 16, State 1, Line 21
Only one expression can be specified in the select list when the subquery is not introduced with EXISTS.

My code

create table #ExcelPrint (row int IDENTITY (1, 1) NOT NULL, Col01 varchar(100), 
Col02 varchar(100), Col03 varchar(100), Col04 varchar(100),Col05 varchar(100))

declare @counter int 
set @counter = 0 
insert into #excelprint (Col01,Col02,Col03) values ('Text','Number', 'Amount')
while @counter > -211 
begin 

insert into #ExcelPrint (Col01,Col02)
select (CONVERT(varchar,Dateadd(DD,@counter,GETDATE()),112)),   
(
select TableA.ColA ,sum(colB)
from db.TableA as A 
inner join db.TableB B on B.Col1 = A.Col1
inner join db.TableC C on C.Col1 = B.Col1
where amount = CONVERT(varchar,Dateadd(DD,@counter,GETDATE()),112)
and A.Col1 = 123
and B = 12
group by ColA.A
)
set @counter = @counter -1 
end

select isnull(Col01,''), Replace(ISNULL(col02,''),'.',','),
Replace(ISNULL(col03,''),'.',',')
,Replace(ISNULL(Col04,''),'.',',') from #ExcelPrint
order by row
drop table #ExcelPrint

Answer 1

change

select (CONVERT(varchar,Dateadd(DD,@counter,GETDATE()),112)),   
(
select TableA.ColA ,sum(colB)
from db.TableA as A 

to

select CONVERT(varchar,Dateadd(DD,@counter,GETDATE()),112))
,TableA.ColA 
,sum(colB)
from db.TableA as A ...

fix the number of column in the insert clause and group on the appropriate column...

Answer 2

i don't know if it's the real syntax of your query but i have some interrogation about it.

1. Why naming db.TableA as A and then in the select do : TableA.xxx do A.xxx
2. In your select you have a ColA and in your where clause a Col1 is it correct and supposed to be different?
3. Still in your where clause, you have a table B, but what is the B = 12?
4. If you wanna have a sum of everything by date, you shoud remove the third column A.ColA or write your query differently. At this moment as you are doing a group by Date, ColA it's splitted :)
5. in the where clause, amount is the date of the "transaction"?

Except these and they are most syntax than logic, it should work.