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my $hoh = $dbh->selectall_hashref($sql, $index_column);
$hoh = { 1 => {id => 1, col2=>"abc", col3=>"def", col4=>"ghi"}, 2 => {id => 2, col2=>"lmn", col3=>"opq", col4=>"rst"}, }
my $aoa = $dbh->selectall_arrayrefref($sql);
$aoa = [ [1,"abc", "def", "ghi"], [2,"lmn", "opq", "rst"], ]
my $aoh = $dbh->selectall_arrayref($sql, {Slice => {}});
$aoh = [ {id => 1, col2=>"abc", col3=>"def", col4=>"ghi"}, {id => 2, col2=>"lmn", col3=>"opq", col4=>"rst"}, ]
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