Hay Madhavanll,

You should not use $2 has key in %hash, please find the modified code.

use strict;
use warnings;
use Data::Dumper;
my $file = './data.txt';
my %hash;
open my $fh, '<', $file or die "Could not open '$file' $!";
while(<$fh>)
{
        chomp();
        if(/SQL :: (.*), Time Taken :: (.*)/i)
        {
                #print "$1=$3\n";
                $hash{$1}->{count}++;
                $hash{$1}->{total} +=$2;

                if(defined $hash{$1}->{min})
                {
                        if ($hash{$1}->{min} > $2)
                        {
                                $hash{$1}->{min} = $2;
                        }
                }
                else
                {
                        $hash{$1}->{min} = $2;
                }
 if(defined $hash{$1}->{max})
                {
                        if ($hash{$1}->{max} < $2)
                        {
                                $hash{$1}->{max} = $2;
                        }
                }
                else
                {
                        $hash{$1}->{max} = $2;
                }
        }
        else
        {
                print "not matching\n";
        }

}
print Dumper \%hash;
[download]