A、 select name from teacher where email=null;
B、 select name from teacher where email<>null;
C、 select name from teacher where email is null;
D、 select name from teacher where email is not null;
答案:C
A、 select name from teacher where email=null;
B、 select name from teacher where email<>null;
C、 select name from teacher where email is null;
D、 select name from teacher where email is not null;
答案:C
A. 0
B. 空
C. 调整后金额
D. 1
A. ALTER TABLE
B. DROP ANY TABLE
C. DELETE ANY TABLE
D. TRUNCATE ANY TABLE
A. ZETV13
B. ZETV95
C. ZETV94
D. ZETV31
A. 事件处置
B. 应急处置
C. 事件上报
D. 事件分析
A. select name from teacher where email=null;
B. select name from teacher where email<>null;
C. select name from teacher where email is null;
D. select name from teacher where email is not null;
A. Windows
B. Linux
C. AIX
D. FreeBSD
A. 枚举
B. 对象类型
C. 对象分类
D. 分类体系确定的数值