Dynamic Multi Pivot in SQL Server - sql

Question

I am new to SQL Server Pivot. I have an input table with data represented like the below. It has model data with three amount columns. The amounts are applicable for those models based on the date provided.
I am trying to generate a report like the below in a dynamic fashion where distinct number of dates along with three amounts should be displayed in the report for each model.
I have tried a Dynamic SQL like the below.
SELECT #pivotcols = STUFF((
SELECT ',' + QUOTENAME(DATE)
FROM #table
GROUP BY Date
ORDER BY Date
FOR XML PATH('')
,TYPE
).value('.', 'NVARCHAR(MAX)'), 1, 1, '')
SET #query = N'SELECT Model,' + #pivotcols + N' from
(
SELECT Model
,Amount1
,Amount2
,Amount3
,[DATE] AS DATE1
,[DATE] AS DATE2
,[DATE] AS DATE3
FROM #table
) x
pivot
(
max(amount1)
for Date1 in (' + #pivotcols + N')
) r
pivot
(
max(amount2)
for Date2 in (' + #pivotcols + N')
) p
pivot
(
max(amount3)
for Date3 in (' + #pivotcols + N')
) o '
EXEC sp_executesql #query;
When I try with this query I am getting the following error.
The column name "2000-01-01" specified in the PIVOT operator conflicts with the existing column name in the PIVOT argument.
Kindly show some light on this.

Answer 1

Finally I achieved the results using the below query
DECLARE #selectcols AS NVARCHAR(MAX) = ''
,#pivotcols AS NVARCHAR(MAX) = ''
,#query AS NVARCHAR(MAX) = ''
SELECT #selectcols = STUFF((
SELECT ',[AMT1-' + convert(VARCHAR(10), [DATE], 101) + ']'
+ ',[AMT2-' + convert(VARCHAR(10), [DATE], 101) + ']'
+ ',[AMT3-' + convert(VARCHAR(10), [DATE], 101) + ']'
+ ',[TOT-' + convert(VARCHAR(10), [DATE], 101) + ']'
FROM #table
GROUP BY [DATE]
ORDER BY [DATE]
FOR XML PATH('')
,TYPE
).value('.', 'NVARCHAR(MAX)'), 1, 1, '')
SELECT #pivotcols = STUFF((
SELECT ',[AMT1-' + convert(VARCHAR(10), [DATE], 101) + ']'
FROM #table
GROUP BY [DATE]
ORDER BY [DATE]
FOR XML PATH('')
,TYPE
).value('.', 'NVARCHAR(MAX)'), 1, 1, '')
SET #query = N'SELECT [Model],' + #selectcols + N' from
(
select [Model],AMT1,AMT2,AMT3,AMT1+AMT2+AMT3 AS TOT
,''AMT1-'' + convert(VARCHAR(10), [DATE], 101) as DATE1
,''AMT2-'' + convert(VARCHAR(10), [DATE], 101) as DATE2
,''AMT3-'' + convert(VARCHAR(10), [DATE], 101) as DATE3
,''TOT-'' + convert(VARCHAR(10), [DATE], 101) as DATE4
from #table
) x
pivot
(
max(AMT1)
for DATE1 in (' + #pivotcols + N')
) r
pivot
(
max(AMT2)
for DATE2 in (' + replace(#pivotcols,'AMT1','AMT2') + N')
) p
pivot
(
max(AMT3)
for DATE3 in (' + replace(#pivotcols,'AMT1','AMT3') + N')
) o
pivot
(
max(TOT)
for DATE4 in (' + replace(#pivotcols,'AMT1','TOT') + N')
) t'
EXEC sp_executesql #query;