What an Idea pragrammatic.... Nearly from three days struggling with this. Finally I solved it. Working great. Thank you very much. And I want to ask you one more thing. As already told I have three (Postpaid, Prepaid, Delivery) files for every 10 minutes. After calculating I am uploading all the values into DB like this. 

   Date      Hour    Mo_resp  MT_resp     AO_resp     Percentage
10-08-2015   00:00    256       382          36          87%
10-08-2015   00:10    491       438          12          92%

[download]

(Its a sample. Actually my DB contains 38 columns) Like this I am uploading all values for every 10 minutes. Now my requirement is to add all MO_resp all AO_resp ... and son on (all columns) which occurred in 00 hour to write an hourly report in excel sheet. For that I am Doing 

 
use DBI;
my $hour_db = DBI->connect("DBI:mysql:database=$db;host=$host;mysql_so
+cket=/opt/lampstack-5.5.27-0/mysql/tmp/mysql.sock","root","", {'Raise
+Error' => 1});
my @column_names = ("MO_resp","MT_resp","AO_resp");
foreach my $column_name (@column_names)
{
    my $hour_sth = $hour_db->prepare("Select sum($column_name) from $t
+able_name where Date='$db_date' and Hour like='$hour:%'");
    $hour_sth->execute() or die $DBI::errstr;
    .....    
}

[download]

#Like this I am reading each column sum one by one. But I feel this is not a good method. Can you show me a way???

In reply to Re^6: using system command in regex by ravi45722
in thread using system command in regex by ravi45722

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