单项选择题
A. All users except SYS
B. All users except SCOTT
C. All users except sys and SCOTT
D. All users except sys, system, and SCOTT
多项选择题 Examine the following command: CREATE TABLE (prod_id number(4), Prod_name varchar2 (20), Category_id number(30), Quantity_on_hand number (3) INVISIBLE); Which three statements are true about using an invisible column in the PRODUCTS table?（）
多项选择题 Which three statements are true concerning unplugging a pluggable database (PDB)?（）
多项选择题 Which two are true concerning a multitenant container database with three pluggable database?（）