while (my $row = $sth->fetchrow_arrayref) {
$var->{"@$row[0]"}=" ";
}

Can anyone help me understanding above mentioned.

i) As per my knowledge $row is taking ARRAY Refernce from the database
ii) @$row[0] is containing the value of 0th index of the array, testted the same.

but I am not able understand the meaning of below mentioned, as it looks like the we are trying to initialize the value to hash, don't know????

my $var->{"@$row[0]"}=" ";