SELECT b.cognome, b.id, a.codvis FROM table1 b, table2 a WHERE b.id = a.id(+) AND (a.codvis = " & Request("codvis") & " OR a.codvis IS NULL) ORDER BY cognome
sql = "SELECT b.cognome, b.id, a.codvis FROM table1 b LEFT JOIN table2 a ON b.id = a.id WHERE a.codvis = " & Request("codvis") & " OR a.codvis IS NULL ORDER BY cognome"
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