fetchall_hashref

Im wondering if its possible to use more than 1 key
for $key_field. For example:

$sth = $dbh->prepare ("SELECT foo, bar, id1, id2 FROM table");
$sth->execute;

Would it be possible to generate a hashref that has id1 and id2
as keys? It should look like this :
$hashref = {
'id1' => {
'id2' => {
'foo' => '',
'bar' => ''
}
}
};

thanks,
Mayuran.

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