To use a hash slice, just dereference the hash like so

@$hashref{keys %some_hash} = values %some_hash;
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Or to grab a single row from a database you could do this

my %data = %{$dbh->selectall_hashref()->[0]};
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Of course this assumes you're only selecting one row from the database and is only really for demonstrative purposes.
HTH

broquaint