Pivoting table in SQL - sql-server

Question

i have a problem with approach how to pivot this table:
How can i convert this:
Would you be kind enough give me hints (not whole code) how to do this? i really dont know where should i start (i dont know whether it is typical pivoting unpivoting)
+------+------+--------+----------+-----------+-----+
| ColI | Col2 | Month | Turnover | Provision | Fee |
+------+------+--------+----------+-----------+-----+
| 123 | Asdf | 201810 | 10000 | 100 | 0,1 |
| 123 | Asdf | 201811 | 20000 | 200 | 0,2 |
| 123 | Asdf | 201812 | 30000 | 300 | 0,3 |
+------+------+--------+----------+-----------+-----+
into this:
+------+------+---------------+-----------------+------------+---------------+-----------------+------------+---------------+-----------------+-----------+
| ColI | Col2 | Turnover20810 | Provision201810 | Fee201810 | Turnover20811 | Provision201811 | Fee201811 | Turnover20812 | Provision201812 | Fee201812 |
+------+------+---------------+-----------------+------------+---------------+-----------------+------------+---------------+-----------------+-----------+
| 123 | Asdf | 10000 | 100 | 0,1 | 20000 | 200 | 0,2 | 30000 | 300 | 0,3 |
+------+------+---------------+-----------------+------------+---------------+-----------------+------------+---------------+-----------------+-----------+
Thank you!

Answer 1

Assuming that each ColI, Col2 group would only have a maximum of three records, then we can try pivoting using the help of ROW_NUMBER:
WITH cte AS (
SELECT *,
ROW_NUMBER() OVER (PARTITION BY ColI, Col2 ORDER BY Month) rn
FROM yourTable
)
SELECT
ColI,
Col2,
MAX(CASE WHEN rn = 1 THEN Turnover END) AS Turnover1,
MAX(CASE WHEN rn = 1 THEN Provision END) AS Provision1,
MAX(CASE WHEN rn = 1 THEN Fee END) AS Fee1,
MAX(CASE WHEN rn = 2 THEN Turnover END) AS Turnover2,
MAX(CASE WHEN rn = 2 THEN Provision END) AS Provision2,
MAX(CASE WHEN rn = 2 THEN Fee END) AS Fee2,
MAX(CASE WHEN rn = 3 THEN Turnover END) AS Turnover3,
MAX(CASE WHEN rn = 3 THEN Provision END) AS Provision3,
MAX(CASE WHEN rn = 3 THEN Fee END) AS Fee3
FROM cte
GROUP BY
ColI,
Col2;
Note that I did not hardwire more specific column names, to keep the query as general as possible. For example, perhaps there might be another ColI, Col2 group which would have a different three months.

Answer 2

By using Dynamic Sql
IF OBJECT_ID('tempdb..#TEMP') IS NOT NULL
DROP TABLE #TEMP
;WITH CTE (ColI , Col2 , Month , Turnover , Provision , Fee )
AS
(
SELECT 123 , 'Asdf' , 201810 , 10000 ,100 ,'0,1' UNION ALL
SELECT 123 , 'Asdf' , 201811 , 20000 ,200 , '0,2' UNION ALL
SELECT 123 , 'Asdf' , 201812 , 30000 ,300 , '0,3'
)
SELECT ColI , Col2,Turnover , Provision , Fee,MixedCol,Reqcol , ROW_NUMBER()OVER(ORDER BY (SELECT NULL)) AS Seq
INTO #Temp
FROM CTE
CROSS APPLY (VALUES (CONCAT('Turnover','_',[Month]),CAST(Turnover AS VARCHAR(20))),
(CONCAT('Provision','_',[Month]),CAST(Provision AS VARCHAR(20))),
(CONCAT('Fee','_',[Month]),CAST(Fee AS VARCHAR(20)))
)DT (MixedCol,Reqcol)
DECLARE #Sql nvarchar(max),
#DynamicColumn nvarchar(max),
#MaxDynamicColumn nvarchar(max)
SELECT #DynamicColumn = STUFF((SELECT ', '+QUOTENAME(CAST(MixedCol AS VARCHAR(100)))
FROM #TEMP ORDER BY Seq FOR XML PATH ('')),1,1,'')
SELECT #MaxDynamicColumn = STUFF((SELECT ', '+'MAX('+QUOTENAME(CAST(MixedCol AS VARCHAR(100)))+') AS '+QUOTENAME(CAST(MixedCol AS VARCHAR(100)))
FROM #TEMP ORDER BY Seq FOR XML PATH ('')),1,1,'')
SET #Sql=' SELECT ColI , Col2,'+ #MaxDynamicColumn+'
FROM
(
SELECT * FROM #TEMP
)AS src
PIVOT
(
MAX(Reqcol) FOR [MixedCol] IN ('+#DynamicColumn+')
) AS Pvt
GROUP BY ColI , Col2 '
EXEC (#Sql)
PRINT #Sql

Answer 3

Q: "...give me hints (not whole code) how to do this"
A: This example with dynamic transpose of table. You can try this. Unpivot your original table and transpose.
CREATE table #tbl (
color varchar(10), Paul int, John int, Tim int, Eric int);
insert #tbl select
'Red' ,1 ,5 ,1 ,3 union all select
'Green' ,8 ,4 ,3 ,5 union all select
'Blue' ,2 ,2 ,9 ,1;
select * FROM #tbl
--1) Transpose. Example without dynamic code. You create list of fields in query
select *
from #tbl
unpivot (value for name in ([Paul],[John],[Tim],[Eric])) up
pivot (max(value) for color in ([Blue],[Green],[Red])) p
--2) Transpose. Example with dynamic code, without names of fields.
DECLARE #cols NVARCHAR(MAX), #query NVARCHAR(MAX), #rows NVARCHAR(MAX)='';
-- XML with all values
SET #cols = STUFF(
(
SELECT DISTINCT
','+QUOTENAME(T.Color) -- Name of first column
FROM #tbl T FOR XML PATH(''), TYPE
).value('.', 'nvarchar(max)'), 1, 1, '');
SELECT #rows=#rows+','+QUOTENAME(Name)
FROM
(SELECT Name,ROW_NUMBER() OVER(ORDER BY column_id) AS 'RowNum'
FROM tempdb.sys.Columns
WHERE Object_ID = OBJECT_ID('tempdb..#tbl')
) AS A WHERE A.RowNum>1
SET #rows=STUFF(#rows,1,1,'')
SET #query='SELECT *
from #tbl
unpivot (value for name in ('+#rows+')) up
pivot (max(value) for color in ('+#Cols+')) p'
EXEC (#query)