is it possible to use two sth from same dbh at the same time ?

[ZhangJun]

my $dbh = DBI->connect();
my $sth1 = $dbh->prepare( $sql_a );
my $sth2 = $dbh->prepare( $sql_b );

$sth1->execute;
$sth2->execute;

while ( my ($id) = $sth1->fetchrow_array ) {
      $sth2->execute( $id )
}


# is it possible ?