$ticket = $query->param('TicketNo');
$detail = $query->param('Detail');
.
.
.

my $temp1 = "UPDATE TSIssuesTable ";
my $temp2 = "SET Detail = ?";
my $temp3 = "WHERE ";
my $temp4 = "TicketNo = $ticket";
	
$SQL = $temp1.$temp2.$temp3.$temp4;
$sth1 = $dbh->prepare( $SQL );
$sth1->execute($details);
...