1Z0-052多項(xiàng)選擇題每日一練(2019.05.09)

A constraint in a table is defined with the INITIALLY IMMEDIATE clause. You executed the ALTER TABLEcommand with the ENABLE VALIDATE option to enable the constraint that was disabled. 
What are the twoeffects of this command（）

After performing a clean shut down of the database instance for maintenance， you mount the database andthen execute a command to open the database：SQL> ALTER DATABASE OPEN；
Which two statements are true（）