in reply to Re^4: Perl script to check database works or does it?
in thread Perl script to check database works or does it?

A hash key can never be undefined. Loop over the values only: 
    defined or $_ = '' for values %$ref;

[download]

Or, in newer Perls, 

    $_ //= '' for values %$ref;

[download]
($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,

[download]

In Section Seekers of Perl Wisdom