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I have a table that contains the fields CustomerID and InvoiceNo. Any of the customers can have one or more invoices. How can I create a query that shows all customers that have at least 2 invoices? I've already tried writing the expression with operators, but they only refer to a specific value...

I'd appreciate it a lot if you could help me with these 2 problems: 1. I have a report that includes a first name and a last name for several customers. The problem is that I have to sort this report in an ascending order first by the last name and then, by the first name within the last name...