Defining dynamic PIVOT sql query in SQL Server - sql

Question

Currently I have a static pivot sql query defined in a stored procedure in sql server:
ALTER PROCEDURE [dbo].[MonthRepo]
-- Add the parameters for the stored procedure here
#from datetime,
#to datetime
AS
BEGIN
DECLARE #cols nvarchar(12)
DECLARE #query nvarchar(max)
SET NOCOUNT ON;
-- Insert statements for procedure here
SELECT *
FROM (
SELECT ROUND(ds.ct_quot_rate,0) AS Quote,
ROUND(ds.ct_quot_rate,0) AS Quote_Out,
ds.isin
FROM ds
WHERE ds.datum >= #from AND ds.datum <= #to
) tbl
PIVOT (
COUNT(Quote)
FOR isin IN(AB000001,
AB000002,
AB000003,
AB000004,
AB000005)
) piv
END
How can I define this static code in dynamic query? I have declared 2 variables.

Answer 1

I think you're after something like this:
ALTER PROCEDURE [dbo].[MonthRepo]
-- Add the parameters for the stored procedure here
#from datetime,
#to datetime
AS
BEGIN
DECLARE #cols nvarchar(max)
DECLARE #query nvarchar(max)
SET NOCOUNT ON;
WITH vals AS (
SELECT DISTINCT isin
FROM ds
)
SELECT #cols = COALESCE(#cols + ',','') + '[' + isin + ']'
FROM vals
SET #query = '
SELECT *
FROM (
SELECT ROUND(ds.ct_quot_rate,0) AS Quote,
ROUND(ds.ct_quot_rate,0) AS Quote_Out,
ds.isin
FROM ds
WHERE ds.datum >= #from_param AND ds.datum <= #to_param
) tbl
PIVOT (
COUNT(Quote)
FOR isin IN(' + #cols + ' )
) piv'
EXECUTE sp_executesql #query, N'#from_param DATETIME, #to_param DATETIME', #from_param = #from, #to_param = #to
END

Answer 2

CREATE PROCEDURE [dbo].[MonthRepo]
-- Add the parameters for the stored procedure here
#from VARCHAR(20),
#to VARCHAR(20)
AS
BEGIN
IF OBJECT_ID('tempdb..#T') IS NOT NULL
DROP TABLE #T
create table #T
(
datnum varchar(20),
quote INT,
isin VARCHAR(20)
)
insert into #T (datnum,quote,isin)values ('2015-01-01',100,'AB000001'),
('2015-01-01',100,'AB000002'),
('2015-01-02',98,'AB000003'),
('2015-01-02',70,'AB000001'),
('2015-01-03',100,'AB000001')
DECLARE #statement NVARCHAR(max)
,#columns NVARCHAR(max)
SELECT #columns = Isnull(#columns + ', ', '') + N'[' + tbl.isin+ ']'
FROM (SELECT DISTINCT isin
FROM #T) AS tbl
--SELECT #columns
SELECT #statement = ' SELECT *
FROM (
SELECT ROUND(ds.quote,0) AS Quote,
ROUND(ds.quote,0) AS Quote_Out,
ds.isin
FROM #T ds
WHERE ds.datnum >= CONVERT(datetime,'+''''+#from+''' ,105) AND ds.datnum <= CONVERT(datetime,'''+#to+''' ,105)
) tbl
PIVOT (
COUNT(Quote)
FOR isin IN(' + #columns+ ')) as PVT
'
PRINT #statement
EXEC sp_executesql #statement = #statement
END
EXEC [MonthRepo] #from = '2015-01-01',#to = '2015-01-10'