SQL Multiple dynamic queries to one query - sql

Question

I am working in a SQL Server 2008 environment with SQL Server Management Studio 2012.
I have written 3 separate queries
QUERY 1
SQL query SUMS all the STOCK ON HAND from an Inventories table
SELECT StockCode,
Sum(QtyOnHand) AS 'SOH'
FROM InvWarehouse
WHERE StockCode NOT LIKE '%DEM%' AND StockCode NOT LIKE '%REF%' AND StockCode NOT LIKE 'Z%'
GROUP BY InvWarehouse.StockCode
QUERY 2
This query looks at future orders from a Purchase Orders Table and dynamically returns the next/following 12 months
DECLARE
#cols AS NVARCHAR(MAX),
#cols1 AS NVARCHAR(MAX),
#cols2 AS NVARCHAR(MAX),
#cols3 AS NVARCHAR(MAX),
#query AS NVARCHAR(MAX)
SELECT #cols = STUFF((SELECT ',' + QUOTENAME(YearMonth)
FROM
-- Selecting Using the Destinct --
(SELECT DISTINCT CAST(YEAR([OrderDueDate]) AS NVARCHAR(4)) + RIGHT('00' + CAST(MONTH([OrderDueDate]) AS NVARCHAR(2)),2) AS YearMonth
FROM PorMasterHdr
JOIN PorMasterDetail
ON PorMasterDetail.PurchaseOrder = PorMasterHdr.PurchaseOrder
WHERE DATEDIFF(MONTH, OrderDueDate, DATEADD(m,12,GETDATE())) <= 12 ) sub
ORDER BY YearMonth
FOR XML PATH(''), TYPE).value('.', 'NVARCHAR(MAX)'),1,1,''),
#cols2 = STUFF((SELECT ',ISNULL(' + QUOTENAME(YearMonth) + ',0) AS ' + QUOTENAME(YearMonth)
FROM
-- Selecting Using the Destinct --
(SELECT DISTINCT CAST(YEAR([OrderDueDate]) AS NVARCHAR(4)) + RIGHT('00' + CAST(MONTH([OrderDueDate]) AS NVARCHAR(2)),2) AS YearMonth
FROM PorMasterHdr
JOIN PorMasterDetail
ON PorMasterDetail.PurchaseOrder = PorMasterHdr.PurchaseOrder
WHERE DATEDIFF(MONTH, OrderDueDate, DATEADD(m,12,GETDATE())) <= 12) sub
ORDER BY YearMonth
FOR XML PATH(''), TYPE).value('.', 'NVARCHAR(MAX)'),1,1,'')
SET #query = '
SELECT MStockCode, ' + #cols2 + '
FROM (
SELECT MStockCode,
MOrderQty,
CAST(YEAR([OrderDueDate]) AS NVARCHAR(4))+RIGHT(''00''+CAST(MONTH([OrderDueDate]) AS NVARCHAR(2)),2) AS YearMonth
FROM PorMasterHdr
JOIN PorMasterDetail
ON PorMasterDetail.PurchaseOrder = PorMasterHdr.PurchaseOrder
WHERE MStockCode NOT LIKE ''%DEM%'' AND MStockCode NOT LIKE ''%REF%'' AND MStockCode NOT LIKE ''Z%''
) AS X
PIVOT (
SUM(MOrderQty)
FOR YearMonth in (' + #cols + ')
) AS PT'
EXECUTE (#query)
QUERY 3
This query looks at the past 12 month of sales data from a Sales table and dynamically returns the last/previous 12 months
DECLARE
#cols AS NVARCHAR(MAX),
#cols1 AS NVARCHAR(MAX),
#cols2 AS NVARCHAR(MAX),
#cols3 AS NVARCHAR(MAX),
#query AS NVARCHAR(MAX)
SELECT #cols = STUFF((SELECT ',' + QUOTENAME(YearMonth)
FROM
-- Selecting Using the Destinct --
(SELECT DISTINCT CAST([TrnYear] AS NVARCHAR(4)) + RIGHT('00' + CAST([TrnMonth] AS NVARCHAR(2)),2) AS YearMonth
FROM ArTrnDetail
WHERE DATEDIFF(MONTH, InvoiceDate, GETDATE()) <= 12 ) sub
ORDER BY YearMonth
FOR XML PATH(''), TYPE).value('.', 'NVARCHAR(MAX)'),1,1,''),
#cols2 = STUFF((SELECT ',ISNULL(' + QUOTENAME(YearMonth) + ',0) AS ' + QUOTENAME(YearMonth)
FROM
-- Selecting Using the Destinct --
(SELECT DISTINCT CAST([TrnYear] AS NVARCHAR(4)) + RIGHT('00' + CAST([TrnMonth] AS NVARCHAR(2)),2) AS YearMonth
FROM ArTrnDetail
WHERE DATEDIFF(MONTH, InvoiceDate, GETDATE()) <= 12) sub
ORDER BY YearMonth
FOR XML PATH(''), TYPE).value('.', 'NVARCHAR(MAX)'),1,1,'')
SET #query = '
SELECT StockCode, ' + #cols2 + '
FROM (
SELECT StockCode,
QtyInvoiced,
CAST([TrnYear] AS NVARCHAR(4))+RIGHT(''00''+CAST([TrnMonth] AS NVARCHAR(2)),2) AS YearMonth
FROM ArTrnDetail
WHERE StockCode NOT LIKE ''%DEM%'' AND StockCode NOT LIKE ''%REF%'' AND StockCode NOT LIKE ''Z%''
) AS X
PIVOT (
SUM(QtyInvoiced)
FOR YearMonth in (' + #cols + ')
) AS PT'
EXECUTE (#query)
The results for each query are correct. Now how do I combine them into one query. So that they return
STOCKCODE | Past 12 Month Sales Per Month | Stock On Hand | Future Purchases
Helicopters | 1 4 5 2 3 4 6 1 3 2 3 2| 15 | 2 3 5 4 6 7 8 4 3 2 8 5
Jam | 2 5 6 4 8 5 8 5 7 2 1 2| 30 | 4 5 6 5 8 7 0 1 2 1 1 4
Frogs | 2 3 2 4 8 5 4 6 8 2 1 3| 7 | 5 7 8 8 6 7 4 0 1 2 1 2
STOCK CODE for the above is the same information from the different tables eg. Helicopters in Inventory is the same as Helicopters in Purchase Orders.

Answer 1

I would suggest the following:
Rewrite #query2 to result in two columns: StockCode and Sales. Instead of selecting each month as a seperate column, concatenate each month in a VARCHAR. You already wrote a variable for #cols for selecting the columns seperately. Keep that for pivoting. Write a variable (#SelSales) to concatenate the results for each month in a VARCHAR and use that in your selection for the Sales column.
Rewrite #query3 to result in two columns: StockCode and Purchases (similar to 1.)
Put your #query1 in a NVARCHAR(MAX) variable (the one selecting the stock).
Write a #query to combine them all.
TSQL outline for #query:
DECLARE #query NVARCHAR(MAX);
SET #query=N'
SELECT
COALESCE(stock.StockCode,sales.StockCode,purchases.StockCode) AS StockCode,
COALESCE(sales.Sales,''0 0 0 0 0 0 0 0 0 0 0 0'') AS Sales,
COALESCE(stock.SOH,0) AS Stock,
COALESCE(purchases.Purchases,''0 0 0 0 0 0 0 0 0 0 0 0'') AS Purchases
FROM
('+#query1+') AS stock
FULL JOIN ('+#query2+') AS sales ON sales.StockCode=stock.StockCode
FULL JOIN ('+#query3+') AS purchases ON purchases.StockCode=stock.StockCode';
EXEC(#query);