You could do
my ($query, $sth, $rv);
$query = ...;
$sth = ...;
$rv = ...;
...
$query = ...;
$sth = ...;
$rv = ...;
...
I did that in a .t file recently. The complexity of the alternative was immense.
Of course, in your specific case, you could write
my $first_result = $dbh->selectrow_hashref(
"SELECT something FROM somewhere"
);
my $second_result = $dbh->selectrow_hashref(
"SELECT somethingelse FROM somewhereelse"
);
what is actually happening in memory
Two different variables are created, as if they had different names.
$ perl -MO=Concise -e'my $x; my $x; my $y;' 2>&1 | grep padsv
3 <0> padsv[$x:1,4] vM/LVINTRO ->4
5 <0> padsv[$x:2,4] vM/LVINTRO ->6
7 <0> padsv[$y:3,4] vM/LVINTRO ->8
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