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Examine the structure of the EMPLOYEES table: EMPLOYEE_ID NUMBER NOT NULL, Primary Key EMP_NAME VARCHAR2(30) JOB_ID NUMBER\ SAL NUMBER MGR_ID NUMBER . References EMPLOYEE_ID column DEPARTMENT_ID NUMBER . Foreign key to DEPARTMENT_ID column of the. . DEPARTMENTS table You created a sequence called EMP_ID_SEQ in order to populate sequential values for the EMPLOYEE_ID column of the EMPLOYEES table. Which two statements regarding the EMP_ID_SEQ sequence are true? (Choose two.)
Correct Answer: C,D
Explanation/Reference: Explanation: the EMP_ID_SEQ sequence is not affected by modification to the EMPLOYEES table. Any other column of NUMBER data type in your schema can use the EMP_ID_SEQ sequence. Incorrect answer: A. EMP_ID_SEQ sequence can be use to populate JOB_ID B. EMP_ID_SEQ sequence will not be invalidate when column in EMPLOYEE_ID is modify. E. EMP_ID_SEQ sequence will be dropped automatically when you drop the EMPLOYEES table. F. EMP_ID_SEQ sequence will be dropped automatically when you drop the EMPLOYEE_ID column. Refer: Introduction to Oracle9i: SQL, Oracle University Study Guide, 12-4