That code isn't really building an array of hashes. @rec is an array, and $thisrecord is a reference to it. So you're really building an array of arrays, each array containing possibly a single item which is a hash ref?
You probably want something more like:
my %rec = {LastName=>$result[1], FirstName=>$result[2], TimeIn=>$res
+ult[3], TimeOUT=>$result[4]};
my $thisrecord = \%rec;
But, you could avoid those temporary variables altogether by just doing:
push @{$ID{$result[0]}}, {LastName=>$result[1], FirstName=>$result[2
+], TimeIN=>$result[3], TimeOUT=>$result[4]};
use Disclaimer::Standard; # the code above is untested and may contain errors
Alan
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