SQL Server dynamic pivot as stored procedure using parameters - sql-server

Question

I have been working to make a dynamic pivot in SQL Server that a user could call in a stored procedure and pass specified parameters ie:
exec piv(schema, table, agg_type, aggCol, newCol)
I am struggling to finish out the schema and table parameters.
Here is what I have so far:
BEGIN
DECLARE #Piv AS NVARCHAR(max) --final pivot. print this to see the exec statement
DECLARE #NewColumns AS NVARCHAR(max) -- extract data and format to make new columns
DECLARE #COLUMNS AS NVARCHAR(MAX) -- list of all columns to be used for CTE below
DECLARE #PivColumns AS NVARCHAR(MAX) --list of all columns except the 2 columns involved in pivot
--declaring parameters here for now
declare #aggCol nvarchar(max)
declare #newCol nvarchar(max)
declare #table nvarchar(max)
declare #schm nvarchar(max)
--To be used for parameters in the SP
set #schm = 'dbo'
set #table = 'Report'
set #aggCol = 'Flag'
set #newCol = 'Category'
-- extracts data and formats for new columns... here is where I'm stuck.
-- I have tried every way I can find to pass the variables in this statement and no luck
SELECT #NewColumns = COALESCE(#NewColumns + ',','') + QUOTENAME(CATEGORY) + char(13)
FROM
(
SELECT DISTINCT Category --needs to be dynamic ie: #newCol
FROM
dbo.Report --needs to be dynamic ie: #table
) AS B
-- list of all columns to be used for CTE below
SELECT #Columns = COALESCE(#Columns + ',','') + QUOTENAME(COLUMN_NAME) + char(13)
FROM
(
SELECT DISTINCT COLUMN_NAME
FROM
(
SELECT
SCHEMA_NAME(T.SCHEMA_ID) AS 'SCHEMA_NAME' -- GET THIS WORKING TO GET A SPECIFIC TABLE
,T.NAME AS 'TABLE_NAME'
,C.NAME AS 'COLUMN_NAME'
FROM SYS.COLUMNS C
INNER JOIN SYS.TABLES T ON C.OBJECT_ID = T.OBJECT_ID
WHERE T.NAME = #table) AS A
) AS B
ORDER BY B.COLUMN_NAME
--list of all columns except the 2 columns involved in pivot
SELECT #PivColumns =
COALESCE(#PivColumns + ',','') + QUOTENAME(COLUMN_NAME) + char(13)
FROM
(
SELECT DISTINCT COLUMN_NAME
FROM
(
SELECT
SCHEMA_NAME(T.SCHEMA_ID) AS 'SCHEMA_NAME' -- GET THIS WORKING TO GET A SPECIFIC TABLE
,T.NAME AS 'TABLE_NAME'
,C.NAME AS 'COLUMN_NAME'
FROM SYS.COLUMNS C
INNER JOIN SYS.TABLES T ON C.OBJECT_ID = T.OBJECT_ID
WHERE T.NAME = #table
and (C.name not like #aggCol or C.name not like #newCol)
) AS A
) AS B
ORDER BY B.COLUMN_NAME
--Removes columns that are used on the pivot
SET #PivColumns = REPLACE(REPLACE(#PivColumns,char(13)+',['+#aggcol+']',''),char(13)+',['+#newcol+']','')
--final statement to print/exec
SET #Piv ='
WITH T1 AS
(
SELECT
'+#COLUMNS+'
FROM
'+#table+'
)
SELECT
'+#PivColumns+'
,'+#NewColumns+'
FROM T1
PIVOT
(MAX(FLAG) FOR CATEGORY IN ('+#NewColumns+'))AS PIV'
print(#Piv)
END
Feel free to add suggestions or edit in any way ie: tempTable, cte, etc...
I built this in another window that gets me what I need but I do not think I can use it in the first statement:
BEGIN
DECLARE #NewColumns AS NVARCHAR(max)
declare #newCol nvarchar(max)
declare #table nvarchar(max)
set #newCol = 'Category'
set #table = '[dbo].[REPORT]'
Select #NewColumns =
'
DECLARE #NewColumns AS NVARCHAR(max)
declare #table nvarchar(max)
SELECT #NewColumns = COALESCE(#NewColumns + '','','''') + QUOTENAME(CATEGORY) + char(13)
FROM
(
SELECT DISTINCT '+#newCol+'
FROM
'+#table+'
) AS B
print(#NewColumns)
'
exec(#NewColumns)
end

Answer 1

Try this
DECLARE #SQL VARCHAR(MAX)
DECLARE #List VARCHAR(MAX)
DECLARE #SQLList nVARCHAR(MAX)
SET #SQLList=N'select #List=stuff((SELECT DISTINCT '',''+AccountType FROM '+#table+'. FOR XML PATH('''')),1,1,'''')'
exec sp_executesql #SQLList ,N'#List VARCHAR(MAX) out', #List out
select #List
SET #SQL=
'
SELECT * FROM (SELECT '+#newCol +','+#aggCol+'
FROM '+#table+') AS SourceTable
PIVOT
(
'+#agg_type+'('+#aggCol+')
FOR '+#newCol +'IN ('+#List+')
) AS PivotTable;'
exec(#SQL)