Oracle中隨機抽取N條記錄

• 從表zeeno中「全表掃描」隨機抽取10%的記錄，隨機查詢5條記錄    

SQL>select object_name from zeeno sample(10) where rownum<6;

• 從表zeeno中「採樣表掃描」隨機抽取10%的記錄，隨機查詢5條記錄

SQL> select object_name from zeeno sample block(10) where rownum<6;