试题详情
- 单项选择题 You own a table called EMPLOYEES with this table structure: EMPLOYEE_ID NUMBER Primary Key FIRST_NAME VARCHAR2(25) LAST_NAME VARCHAR2(25) HIRE_DATE DATE What happens when you execute this DELETE statement? DELETE employees; （）
A、You get an error because of a primary key violation.
B、The data and structure of the EMPLOYEES table are deleted.
C、The data in the EMPLOYEES table is deleted but not the structure.
D、You get an error because the statement is not syntactically correct.
- C
关注下方微信公众号，在线模考后查看
热门试题
- Evaluate the set of
- 介绍日志的种类，各种日志的运行机制，各有
- You work
- The tnsnames.ora fil
- Exhibit： View&e
- 以下数据类型中，（）是固定长度的数据类型
- （）是Oracle最高一级逻辑存储结构。
- In which two cases w
- You have
- Given： Which f
- You want
- 下列哪个子句实现对一个结果集进行分组和汇
- You are maintaining
- （）可用于返回会话中的日期和时间。
- You are
- Which of the followi
- You work
- Examine the&en
- Globalization suppor
- Given: Whatistheres