Hello great perlmonks! I have a mysql database and i want to update some records from it, but instead of updating only those records it rewrites the whole database with the records updated and i lose the rest of the information. Here is my code: 
my @name=("Anna","Maria","Carmen");
my @age=("25","27","29");
my @eyes=("brown","blue","pink");
#those arrays have always the same number of elements
for (my $i=0;$i<=$#name;$i++){    
                        
        my $sth=$dbh->prepare(qq{UPDATE tnt SET `Age`=\"$age[$i]\",`Ey
+es`=\"$eyes[$i]\" WHERE  `Name`=\"$name[$i]\"});
        $sth->execute();
        }
                $sth->finish;

[download]
If i have in the database the following entries: 
Name     Age Eyes
Corina   13  red
Ada      17  blue
Anna     10  grey
Maria    2  white
Carmen   6

[download]
After updating in my way: 
Anna 25 brown
Maria 27 blue
Carmen 29 pink

[download]
and i lose the other records. Thank you very much for your time

In reply to updating a database by bory

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.