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USE database;

...
                       s_t_id INTn) NOT NULL DEFAULT 0,
                       [...]
                      );

$dbh->selectall_arrayref("SELECT * FROM taxon, node WHERE n_t_id = t_i
+d");

$dbh->selectrow_arrayref("SELECT * FROM node, taxon WHERE n_id = XXX A
+ND t_id = n_t_id");