I'm often confused by whether I need to include all the fields I mention in my WHERE clauses when selecting fields for the result set, and it's just now coming to a head - perhaps someone here could clarify for me.

Let's say for example I want a list of all the items ever purchased by a client, and those items are linked to the client number through a long tree:

Clients ---- Invoices ---- InvDetail ---- Items

Can I get this list by saying:

SELECT Items.ItemName FROM Items, InvDetail, Invoices ;
WHERE Invoices.ClientNo = "12345" ;
AND InvDetail.InvoiceNo = Invoices.InvoiceNo ;
AND Items.ItemNo=InvDetail.ItemNo ;
ORDER BY 1 ;
INTO CURSOR JustItems

... or do I need to include clientno, both invoiceno's and both itemno's in the field list?????

TIA