Tranposing Rows to Columns (PIVOT) SQL - sql

Question

I have a table of data that I am attempting to transpose/pivot rows to columns with.
I'm au fait with PIVOT/UNPIVOT and I tried to do this however due to the aggregation used with PIVOT I was only returning 1 result which was the first Endorsement "M06" and not the other 2 Endorsements for that PolRef#.
Here is my data example:
CREATE TABLE #temptable (
[B#] int,
[key#] varchar(24),
[Ref#] varchar(6),
[PolRef#] varchar(10),
[Sequence#] int,
[Date] datetime,
[Endnumber] varchar(4),
[Desc] varchar(76),
[Value] int,
[Specdrivers] varchar(76),
[Reg] varchar(76)
)
INSERT INTO #temptable VALUES
( 6, '484F445830314D4330310132', 'HODX01', 'HODX01MC01', 1050, N'2019-09-20T00:00:00', 'M06', 'Garaging/storage', 0, NULL, 'All' ),
( 6, '484F445830314D433031013C', 'HODX01', 'HODX01MC01', 1060, N'2019-09-20T00:00:00', '046', 'NCB deleted', 0, NULL, 'All' ),
( 6, '484F445830314D4330310146', 'HODX01', 'HODX01MC01', 1070, N'2019-09-20T00:00:00', '099', 'Limited mileage', 1500, NULL, 'All' )
DROP TABLE #temptable
Essentially I need a column for each row that says "Applicable Endorsement" for just the Endnumber value.
Output would look like:
| B# | PolRef# | Applicable Endorsement | Applicable Endorsement | Applicable Endorsement |
| 6 | HODX01MC01 | M06 | 046 | 099 |
Any thoughts on how I can go about this, note there can be any number of endorsements it isn't a fixed amount.

Answer 1

You can use the following PIVOT:
;WITH PrePivot AS
(
SELECT
T.B#,
T.PolRef#,
T.Endnumber,
PivotRanking = ROW_NUMBER() OVER (
PARTITION BY
T.B#,
T.PolRef#
ORDER BY
(SELECT NULL)) -- Determine the order here, maybe T.Date?
FROM
#temptable AS T
)
SELECT
P.B#,
P.PolRef#,
[Applicable Endorsement] = P.[1],
[Applicable Endorsement] = P.[2],
[Applicable Endorsement] = P.[3],
[Applicable Endorsement] = P.[4],
[Applicable Endorsement] = P.[5]
FROM
PrePivot AS V
PIVOT (
MAX(V.Endnumber) FOR V.PivotRanking IN ([1],[2],[3],[4],[5])
) AS P
I've written up to 5 endorsements, you can add as many as you want. If you want a dynamic amount, you need to use a dynamic pivot.
B# PolRef# Applicable Endorsement Applicable Endorsement Applicable Endorsement Applicable Endorsement Applicable Endorsement
6 HODX01MC01 M06 046 099 NULL NULL

Answer 2

Try this Dynamic Sql
IF OBJECT_ID('tempdb..#FormatedTable')IS NOT NULL
DROP TABLE #FormatedTable
Go
SELECT ROW_NUMBER()OVER(ORDER BY (SELECT 1)) As SeqId,'Applicable Endorsement'+CAST(ROW_NUMBER()OVER(ORDER BY (SELECT 1)) AS VARCHAR(100)) AS ReqColumn,*
INTO #FormatedTable
FROM #temptable
DECLARE #Sql nvarchar(max),
#DynamicColumn nvarchar(max),
#MaxDynamicColumn nvarchar(max)
SELECT #DynamicColumn = STUFF((SELECT ', '+QUOTENAME(ReqColumn)
FROM #FormatedTable FOR XML PATH ('')),1,1,'')
SELECT #MaxDynamicColumn = STUFF((SELECT ', '+'MAX('+(QUOTENAME(ReqColumn))+') AS '+QUOTENAME(CAST(ReqColumn AS VARCHAR(100)))
FROM #FormatedTable ORDER BY SeqId FOR XML PATH ('')),1,1,'')
SELECT #MaxDynamicColumn
SET #Sql=' SELECT [B#],[PolRef#], '+ #MaxDynamicColumn+'
FROM
(
SELECT * FROM #FormatedTable
) AS src
PIVOT
(
MAX(Endnumber) FOR [ReqColumn] IN ('+#DynamicColumn+')
) AS Pvt
GROUP BY [B#],[PolRef#]
'
PRINT (#Sql)
EXEC (#Sql)
Result
B# PolRef# Applicable Endorsement1 Applicable Endorsement2 Applicable Endorsement3
--------------------------------------------------------------------------------------------
6 HODX01MC01 M06 046 099