多项选择题 Examine the following statement that is used to modify the constraint on the SALES table： SQL> ALTER TABLE SALES MODIFY CONSTRAINT pk DISABLE VALIDATE； Which three statements are true regarding the above command（）

单项选择题 View the Exhibit and examine the privileges granted to the SL_REP user. The EMP table is owned by the SCOTT user. The SL_REP user executes the following command: SQL> GRANT SELECT ON scott.emp TO hr;  Which statement describes the outcome of the command（）

单项选择题 Observe the information in the columns：  1： The SGA     a. Text and parsed forms of all SQL statements  2： The cursor state   b. Run-time memory values for the SQL statement， such as rows retrieved  3： User-session data   c. Security and resource usage information  4：The stack space   d. Local variables for the process  Which option has the correct match between the memory areas and their contents（）