试题详情
- 多项选择题 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 orderto populate sequential values for the EMPLOYEE_ID column of the EMPLOYEES table. Which two statements regarding the EMP_ID_SEQ sequence are true? （）
A、You cannot use the EMP_ID_SEQ sequence to populate the JOB_ID column.
B、The EMP_ID_SEQ sequence is invalidated when you modify the EMPLOYEE_ID column.
C、The EMP_ID_SEQ sequence is not affected by modifications to the EMPLOYEES table.
D、Any other column of NUMBER data type in your schema can use the EMP_ID_SEQ sequence.
E、The EMP_ID_SEQ sequence is dropped automatically when you drop the EMPLOYEES table.
F、The EMP_ID_SEQ sequence is dropped automatically when you drop the EMPLOYEE_ID column.
关注下方微信公众号，在线模考后查看
热门试题
- You added a PHONE_N
- Examine the structu
- Examine the descrip
- The user Sue issues
- Which statement crea
- In a SELECT statemen
- The ORDERS table ha
- Evaluate this SQL s
- Examine the structu
- Examinethestructureo
- In which case would
- A SELECT statement
- Which two are true a
- EvaluatetheSQLstatem
- Which two statements
- You need to change t
- Examine the structu
- You would like to di
- Examine the SQL sta
- You created a view