I have the following tables:

1. Customers.Customerid (inner join) Products.Customerid
2. Customers.Addressid (inner join) Address.Addressid
3. Customers.Customerid (inner join) invoices.invoiceid
4. Invoices.Invoiceid (inner join) invdetail.invoiceid

I would like to create a cursor where "Invoice.cTypd = 'EST'"