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$dbh->selectall_arrayref(
      "SELECT ename FROM emp ORDER BY ename",
      { Slice => {} }
  );

 my $emps = $dbh->selectall_arrayref(
      "SELECT ename FROM emp ORDER BY ename",
...
  foreach my $emp ( @$emps ) {
      print "Employee: $emp->{ename}\n";
  }

@array [ value, value2, value3]
or
$string = "value, value2, value3";