---

You find this query being used in your Oracle 12c database: Which method a used by the optimizer to limit the rows being returned?（）
A:A filter is added to the table query dynamically using ROWNUM to limit the rows to 20 percent of the total rows
B:All the rows are returned to the client or middle tier but only the first 20 percent are returned to the screen or the application.
C:A view is created during execution and a filter on the view limits the rows to 20 percent of the total rows.
D:A TOP-N query is created to limit the rows to 20 percent of the total rows

---

出自：Oracle认证

显示答案