题目内容

如何看待历史的误用与滥用？如何避免？

查看答案

搜索结果不匹配？点我反馈

更多问题

微波能量相当于（）能级。

A. 分子振动
B. 价电子
C. 内层电子
D. 分子转动

查看答案

宋代官学的发展有哪些？

查看答案

推广机构发生客户申请资料遗失的，应在（）内及时上报总行。

A. 8小时
B. 24小时
C. 48小时
D. 10天

查看答案

The EMP table contains these columns: LAST NAME VARCHAR2(25) SALARY NUMBER(6,2) DEPARTMENT_ID NUMBER(6) You need to display the employees who have not been assigned to any department. You write the SELECT statement: SELECT LAST_NAME, SALARY, DEPARTMENT_ID FROM EMP WHERE DEPARMENT_ID = NULL; What is true about this SQL statement? （）

A. The SQL statement displays the desired results.
B. The column in the WHERE clause should be changed to display the desired results.
C. The operator in the WHERE clause should be changed to display the desired results.
D. The WHERE clause should be changed to use an outer join to display the desired results.

查看答案