How to properly create a Dynamic Pivot Function in SQL? [duplicate] - sql

Question

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Group by column and multiple Rows into One Row multiple columns
(2 answers)
Closed 8 months ago.
I come back with my problem. I've been trying to create a dynamic pivot procedure but I have some trouble while creating the columns.
Example:
TranID
Bank Name
NetAmount
Account
01
StormWindBank
23.0$
A
02
StormWindBank
14.0$
B
03
StormWindBank
00.0$
A
04
StormWindBank
12.0$
B
Result intended :
Account
Bank Name
NetAmount
NetAmount2
A
StormWindBank
23.0$
00.0$
B
StormWindBank
14.0$
12.0$
SELECT DISTINCT [Account]
,[Currency]
,TranID
,[Bank Code]
,[Bank Name]
,[Client No_]
,[NetAmount]
INTO #TEMP
FROM [My Table]
DECLARE #cols AS NVARCHAR(MAX),
#query AS NVARCHAR(MAX);
select #cols = STUFF((SELECT distinct ',' + QUOTENAME(c.NetAmount)
FROM #TEMP c
FOR XML PATH(''), TYPE
).value('.', 'NVARCHAR(MAX)')
,1,1,'')
set #query = 'SELECT [Account], [Bank Name], ' + #cols + ' from
(
select [Account],TranID, NetAmount, [Bank Name]
from #TEMP
) x
pivot
(
max(TranID)
for NetAmount in (' + #cols + ')
) p '
So far, I have the result below:
Account
Bank Name
23.0$
00.0$
A
StormWindBank
1
2
B
StormWindBank
3
4
The 1, 2, 3, 4 are the TranID.
I'm close but I have been struggling to fix that, anyone have an idea ?
Thank you!

Answer 1

You need to PIVOT off a derived column using row_number()
Example
Declare #SQL varchar(max) = stuff( ( Select Distinct concat(',[NetAmount',row_number() over (partition by [Bank Name],[Account] order by [TranID]),']' )
From #TEMP For XML Path('') ),1,1,'')
Set #SQL = '
Select *
From (
Select [Account]
,[Bank Name]
,Item = concat(''NetAmount'',row_number() over (partition by [Bank Name],[Account] order by [TranID]) )
,Value = [NetAmount]
from #TEMP
) src
Pivot ( max( [Value] ) for Item in ('+ #SQL +') ) pvt
'
Exec(#SQL)
Results
Account Bank Name NetAmount1 NetAmount2
A StormWindBank 23.0$ 00.0$
B StormWindBank 14.0$ 12.0$