I realize that when I stop thinking and go walking than solutions appear in my mind
Yet, I insist in stay long non-stop hours working

About your code below, I have a message error

"Object tPrinters not found"

Sorry if I seem lazy, but I am really not used to SQL


DELETE tPrinters from tPrinters LEFT JOIN ptTemp T on UPPER(tPrinters.ptTemp.Nome) = UPPER(T.nome) where T.Nome is NULL