下面关于视图的SQL语句，那个是正确的。（ ） A: drop view view01 B: delete view view02 C: drop view01 D: delete view02

下面关于修改视图的SQL语句，那个是正确的（ ）。 A: alter view VIEW01 as select * from users order by age desc B: alter view VIEW02 as select name,avg(score) as avgScore from studentScore C: alter view VIEW03 as select top 10 id,name,password from admin order by id D: alter view VIEW04 as select * from stuent,class where student.classid=class.classid order by class.classid

在基于RS-485的MODBUS通信中,网关节点发送的报文是:02 02 00 00 00 01 B9 F9,则响应报文正确的是( )。 A: 02 02 01 01 60 0C B: 02 02 02 01 60 0C C: 02 02 01 00 01 60 0C D: 02 02 02 00 60 0C

查询图书编号是"01"或"02"的记录,可以在条件中输入（ ）。 A: "01" and "02" B: not in ("01" , "02") C: in ("01" , "02") D: not ("01" and "02")

筛选图书编号是“01”或“02”的记录,可以在准则中输入()A.()“01”()or()“02”()B.()not()in("01","02")()C.()in("01","02")()D.()not()("01","02")

'2020/02/29'.split('/')的运行结果是： A: '2020' '02' '29' B: 2020 02 29 C: [2020,02,29] D: ['2020','02','29']

Among the six basic views, which one can show the height of an object? () A: Front view, top<br/>view, left side view B: Top view, bottom<br/>view C: Left side view, bottom view, rear view D: Front view, left<br/>side view, right side view, rear view

【单选题】下列是日期型常量的一项是 A. "02/03/2020" B. 02/03/2020 C. {02/03/2020} D. #02/03/2020#

成功连接MQTT后，服务回复： A: 20 02 00 00； B: 20 02 00 01； C: 20 02 00 04； D: 20 02 00 06；

WeregretthatweareunabletoconsideryourrequestforpaymentonD/Aterms.Asarule,weaskforpaymentbyL/C.But,_________________ourfriendlyrelations,wewill,asan A: in view to B: in view with C: in view of D: on view of