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my $query_submitted = "SELECT * FROM rates WHERE weight = 2"; # Hangs

my $query_submitted = "SELECT * FROM rates WHERE zone2 = '4.67'"; # Wo
+rks fine

my $weight = 4; 

my $query_submitted = 'SELECT * FROM rates WHERE weight = ?';
...
# This executes the query
my $sth_submitted = $dbh->prepare($query_submitted) or die "Error prep
+are";
$sth_submitted->execute($weight) or die 'Error';