emp表中,比“FORD”入职晚的员工信息,下列SQL语句正确的是()
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)
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重庆B型地铁列车客室照明采用LED照明,照明灯具的电源皆为AC220V()
A. 对
B. 错
重庆一号线地铁的CCTV系统不具备视频存储信息的检索和回放功能()
A. 对
B. 错
重庆B型地铁列车隔离开关处于“车间”和“切除”位时,受电弓也能升弓()
A. 对
B. 错
重庆一号线地铁列车的CCTV是视频监视系统的意思()
A. 对
B. 错