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my $dbh = DBI->connect("DBI:mysql:database=proyecto;host=localhost",
                         "root", "xyz123",
...
$sth->execute();
   while ((my @row) = $sth->fetchrow_array()) {
   print "$row[0]\n";

my $dbh = DBI->connect("DBI:mysql:database=proyecto;host=localhost",
                         "root", "xyz123",
...


}

DBD::mysql::st execute failed: You have an error in your SQL syntax; c
+heck the manual that corresponds to your MySQL server version for the
+ right syntax to use near '0447 from final
                                          where pat = 0447' at line 1 
+at finaltest.pl line 19.
DBD::mysql::st execute failed: You have an error in your SQL syntax; c
+heck the manual that corresponds to your MySQL server version for the
+ right syntax to use near '0447 from final
                                          where pat = 0447' at line 1 
+at finaltest.pl line 19.

Table :  patente               Table : Final 

...
0002
0003