Question

I am searching Invoice Itemized Table for Invoices with Quantity having >0 and <0. Invoice Itemized table contains details of all the items in an Invoice. How can I write a query that gives all the invoices that have Quantity of items >0 and <0.

Answer 1

How about something like this? This uses two queries. The first finds all the invoices with Negative Quantities. Then it APPLY’s the second query to find from that list of invoices only those that also have positive quantities.

SELECT DISTINCT
  PosNegInvoices.InvoiceID 
FROM ItemizedInvoice AS NegInvoices
CROSS APPLY
(
  SELECT
    InvoiceID
  FROM ItemizedInvoice 
  WHERE InvoiceID = NegInvoices.InvoiceID
  AND Quantity > 0
) AS PosNegInvoices
WHERE NegInvoices.Quantity < 0

Here is another version that uses CTEs:

WITH NegInvoices AS
(
  SELECT
    InvoiceID
  FROM ItemizedInvoice
  WHERE Quantity < 0
),
PosInvoices AS 
(
  SELECT
    InvoiceID
  FROM ItemizedInvoice
  WHERE Quantity > 0
)
SELECT DISTINCT
  PosInvoices.InvoiceID
FROM NegInvoices 
JOIN PosInvoices
ON NegInvoices.InvoiceID = PosInvoices.InvoiceID