Not two sorts. One sort with a properly crafted compare function. 

@a = sort {
    $a->{key1} <=> $b->{key1}
        ||
    $a->{key2} <=> $b->{key2}
} @a;

[download]

I've been reading up on Schwartzian Transforms, which I'm still not sure are applicable here.

It's not. It's used to minimize the cost of expensive compares (e.g. if I/O is done) when sorting long lists.

In reply to Re: sorting array of hashes using multiple keys conditionally by ikegami
in thread sorting array of hashes using multiple keys conditionally by mabman2

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