Am in need of a sample (Newbie question)

Question

I am very new to PL/Sql. I'm want to create a procedure that does the following (I need a sample or pointers to what to read):
I need a procedure that has cursor1 that searches for a list of invoices (createdDate > sysdate-3)
For each of these records i need a new cursor2 that will search for a new set of invoices that have the same invoice date as the returned invoice in the first cursor.
Depending on some criterias in the records in cursor2 I want the procedure to return a list of invoices from both cursor1 and cursor2.
To make this more clear, a sample output would be:
InvoiceNum 18, InvoiceDate 2007/01/02 (from cursor1)
Invoices with same date:
InvoiceNum 3 (from cursor2)
InvoiceNum 7 (from cursor2)
InvoiceNum 19, InvoiceDate 2007/01/08 (from cursor1)
Invoices with same date:
InvoiceNum 8 (from cursor2)
InvoiceNum 17 (from cursor2)
InvoiceNum 18 (from cursor2)
How do I make a procedure that returns two "tables"?
Thanks,
Botzy

Answer 1

My scenario is this:
We sometimes have the problem that an invoice is registered twice - let's say like this:
InvoiceNum        Amount           Date        Vendor
355             15.155,00      01/01/05    SomeVendor
R355            15.165,00      02/01/05    SameVendorNow the invoice 355 was paid yesterday, but today we got a reminder (and interests). With my Procedure I want to catch that newly created invoice, and prevent that it gets paid aswell. And the procedure should check every invoice that was registered today and look for simular invoices throughout the AP system.
If doublets exist, then I want to printout both the invoice today and the invoice that looks like it...
Do you have a suggestion how I should do this with one query (I think it's kinda complex)? The criteria for returning an invoice in the second query would be:
1: Does the vendor have simular name in both invoices?
2: Is the amount of the invoice the same? (plus/minus 5%)
3: Does the new invoice number look like the old one?