If you only want one row then do use
my @result = $dbh->selectrow_array("SELECT MAX(foo) FROM blah");
If you just want one column then
my @rows = @{ $dbh->selectcol_arrayref("SELECT id FROM blah") };
Otherwise do a full $dbh->selectall_arrayref as salvadors suggests or use
the full prepare, execute, fetchrow syntaxes like you were doing originally.
For information on these syntaxes and more read up on the DBI docs.
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