Thank you everyone for your replys - they were very helpfull, its partially solved the mystery, but not completely!!!
Here's a little more detailed explanation:

I need to read a file (line by line of course).
Line looks like that "subject^email^timestamp"

After file is read I need to do Insertion into database. Now, subjects could be the same and I decided to create this datastructure:
%subjects{$subject}{%hash => email, timestamp} (hope it's clear so far)
%subjects is hash, which has "subject" as a key
$subject is array, which holds hashes or emails and times

So, I created this code:

my %subjects;

foreach my $subm(@subm){
        ($subject, $email, $time) = split(/^/, $subm);


        my %info;
        $info{email} = $email;
        $info{time} = $time;

        if(! exists $subjects{$subject}){
                print "Key DOES NOT exist\n";
                $subjects{$subject} = [];
        }else{
                print "KEY DO EXIST\n";
        }

        push @{$subjects{$subject}}, %info;

}
[download]

I have this code to check that everything is correct:

foreach my $key (sort (keys %subjects)){

        print "\n\nKEY = $key";
        my @ar = @{subjects{$key}};
        my $size = @ar;
        print "\nSize of Array = $size";
}
[download]

Unfortunately, Size gives me size =1 , which is not true. Please tell me if I am doing something wrong....

Thank you very much!!!

Edited by Chady -- added code tags.

---

---

• Are you posting in the right place? Check out Where do I post X? to know for sure.
• Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:

  <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>

• Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
• Want more info? How to link or How to display code and escape characters are good places to start.