Outputing Total Numbers of Rows Returned in query using a CTE

Question

The query below is not being parsed by SQL Server and I can understand that the column name needs to be aliased which I have equally done. The idea behind the query is to output the count of rows using a CTE.
USE AdventureWorks2012
DECLARE @TotalRows INT = 0 -- OUTPUT
WITH Invoice AS (
SELECT @TotalRows = COUNT(CustomerID)
, SalesOrderID
, CustomerID
, OrderDate
FROM Sales.SalesOrderHeader
WHERE OrderDate = '2007/07/01'
GROUP BY SalesOrderID
, CustomerID
, OrderDate
SELECT c.CustomerID
, Invoice.SalesOrderID
, Invoice.OrderDate
FROM Sales.Customer AS c
INNER JOIN Invoice
ON c.CustomerID = Invoice.CustomerID
ORDER BY Invoice.OrderDate DESC;
How do I modify the query to produce the desired retult?
Thank you.
Zionlite

Answer 1

Zionlite,
check this>?
DECLARE @TotalRows INT = 0 -- OUTPUT
;WITH Invoice AS
SELECT COUNT(CustomerID) over()
as customer_count
, SalesOrderID
, CustomerID
, OrderDate
FROM Sales.SalesOrderHeader
WHERE OrderDate = '2001/07/01'
GROUP BY SalesOrderID
, CustomerID
, OrderDate
SELECT c.CustomerID
, Invoice.SalesOrderID
, Invoice.OrderDate
, customer_count
FROM Invoice
LEFT JOIN Sales.Customer AS c
ON c.CustomerID = Invoice.CustomerID
ORDER BY Invoice.OrderDate DESC;
So the above query, gives you the rows_count as a seprate column itself. Now you may use this to update the variable by pushing the results to  a temp table and selecting the column value.
Method 2:
Another method can be using the rowcount method..
DECLARE @TotalRows INT = 0 -- OUTPUT
;WITH Invoice AS
SELECT SalesOrderID
, CustomerID
, OrderDate
FROM Sales.SalesOrderHeader
WHERE OrderDate = '2001/07/01'
GROUP BY SalesOrderID
, CustomerID
, OrderDate
SELECT c.CustomerID
, Invoice.SalesOrderID
, Invoice.OrderDate
FROM Invoice
LEFT JOIN Sales.Customer AS c
ON c.CustomerID = Invoice.CustomerID
ORDER BY Invoice.OrderDate DESC;
select @totalrows=@@rowcount
select @TotalRows
Thanks,
Jay
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