SQL : Server dynamic PIVOT query - sql-server

Question

I am trying to make the below Pivot SQL query dynamic.
List of the dynamic customer should be retrieved from below query.
Customer List Query
SELECT
Cust_Name
FROM dbo.Customer
INNER JOIN dbo.Service
ON dbo.Customer.Cust_ID = dbo.Service.Cust_ID
WHERE [Next_Service] BETWEEN '2017-09-01' AND '2015-09-10'
Pivot query
Select *
from
(
select Customer.Cust_Name,Agreementlist.ProductQty,Store.Product_Name as Refill
from dbo.Agreement INNER JOIN dbo.Agreementlist ON dbo.Agreement.Agreement_ID = dbo.Agreementlist.Agreement_ID INNER JOIN dbo.Customer
ON dbo.Customer.Cust_ID = dbo.Agreement.Cust_ID INNER JOIN Store on Store.Pro_ID = dbo.Agreementlist.ProID where CatID='2' and Agreement.Status='Approved'
) x
pivot
(
sum(ProductQty)
for Cust_Name in ("list of customers resulted from the first query")
) p

Answer 1

You can add a cursor to loop over your customers and add them to a variable. This here works.
declare #gruppe nvarchar(max)
declare #gruppeSql nvarchar(max)
declare #SQL nvarchar(max)
DECLARE myCustomers CURSOR FOR
SELECT Cust_Name FROM dbo.Customer INNER JOIN dbo.Service
ON dbo.Customer.Cust_ID = dbo.Service.Cust_ID
WHERE [Next_Service] BETWEEN '2017-09-01' AND '2015-09-10'
set #gruppeSql = ''
OPEN myCustomers
FETCH NEXT FROM myCustomers INTO #gruppe
IF (##FETCH_STATUS>=0)
BEGIN
SET #gruppeSql = #gruppeSql +'[' +#gruppe+']'
FETCH NEXT FROM myCustomers INTO #gruppe
END
WHILE (##FETCH_STATUS<>-1)
BEGIN
IF (##FETCH_STATUS<>-2)
SET #gruppeSql = #gruppeSql + ',[' +#gruppe+']'
FETCH NEXT FROM myCustomers INTO #gruppe
END
CLOSE myCustomers
DEALLOCATE myCustomers
SET #gruppeSql = replace(#gruppesql,'''','')
--select #gruppeSql
SET #SQL = '
Select *
from
(
select Customer.Cust_Name,Agreementlist.ProductQty,Store.Product_Name as
Refill
from dbo.Agreement INNER JOIN dbo.Agreementlist ON
dbo.Agreement.Agreement_ID = dbo.Agreementlist.Agreement_ID INNER JOIN
dbo.Customer
ON dbo.Customer.Cust_ID = dbo.Agreement.Cust_ID INNER JOIN Store on
Store.Pro_ID = dbo.Agreementlist.ProID where CatID=''2'' and
Agreement.Status=''Approved''
) x
pivot
(
sum(ProductQty)
for Cust_Name in ('+#gruppesql+')
) p'
print #sql
exec(#sql)
SQL Print
Result:

Answer 2

I have used this SQL script to create dynamic Pivot
CREATE PROCEDURE [dbo].[dynamicPivot]
(#tablename VARCHAR(250),
#pivotColumn VARCHAR(250),
#groupBy VARCHAR(8000),
#aggregateColumns VARCHAR(250),
#aggregation VARCHAR(250),
#execute INT = 0
)
AS
BEGIN
DECLARE #sql VARCHAR(8000), #pivotcols VARCHAR(8000)= '';
DECLARE #result TABLE(result VARCHAR(8000));
SET #sql = '
declare
#pivotcols varchar(8000) = '''';
with cte as (
select distinct '+#pivotColumn+', ''[''+cast('+#pivotColumn+' as varchar(250))+'']'' col
from '+#tablename+')
select #pivotcols = #pivotcols + col + '',''
from cte
order by '+#pivotColumn+';
set #pivotcols = left(#pivotcols, len(#pivotcols)-1);
select #pivotcols result';
INSERT INTO #result
EXEC (#sql);
SELECT #pivotcols = result
FROM #result;
SET #sql = '
SELECT *
FROM (
SELECT
'+#groupBy+CASE #groupBy
WHEN ''
THEN ''
ELSE ', '
END+#pivotColumn+', '+#aggregateColumns+'
FROM '+#tablename+'
) AS s
PIVOT
(
'+#aggregation+'
FOR '+#pivotColumn+' IN ('+#pivotcols+')
)AS p;';
IF #execute = 0
PRINT(#sql);
ELSE
EXEC (#sql);
END;
GO