A、select ename,hiredate from emp where ename = 'FORD';
B、select ename,hiredate from emp where hiredate > (select hiredate from emp where ename = 'FORD');
C、select ename,hiredate from emp where hiredate > min(hiredate) and ename = 'FORD';
D、select ename,hiredate from emp where hiredate in (select hiredate from emp where ename = 'FORD');
答案:B
A、select ename,hiredate from emp where ename = 'FORD';
B、select ename,hiredate from emp where hiredate > (select hiredate from emp where ename = 'FORD');
C、select ename,hiredate from emp where hiredate > min(hiredate) and ename = 'FORD';
D、select ename,hiredate from emp where hiredate in (select hiredate from emp where ename = 'FORD');
答案:B
A. 外观检查完好
B. 试验合格
C. 经绝缘处理
D. 经检测机构检测
A. DATA BUFFER CACHE
B. LIBRARY CACHE
C. DICTIONARY CACHE
D. LOG BUFFER CACHE
A. TCP请求报文
B. TCP应答报文
C. ICMP请求报文
D. ICMP应答报文
A. 接入蓄电池组前
B. 接入蓄电池组工作结束前
C. 断电检修前
D. 断电检修工作结束前
A. PPP
B. Ethernet II
C. X.25
D. FrameRelay
A. 业务数据
B. 配置文件
C. 运行参数
D. 日志文件
A. ICMP
B. SMTP
C. RIP
D. SNMP
A. 半年
B. 一年
C. 二年
D. 三年