建立信息系选修了1号课程的学生视图，正确的SQL语句为（） A: CREATE VIEW IS_S1 ASSELECT Student.Sno，Sname，Grade FROM Student，SCWHERE Sdept= 'IS' AND Student.Sno=SSno AND SCno= '1'； B: CREATE VIEW IS_S1 (Sno，Sname，Grade) ASSELECT Student.Sno，Sname，Grade FROM Student，SCWHERE Sdept= 'IS' AND SCno= '1'； C: CREATE VIEW IS_S1 (Sno，Sname，Grade) ASSELECT Student.Sno，Sname，GradeFROM Student，SC WHERE Sdept= 'IS' ANDStudent.Sno=SSno AND SCno= '1'

有如下SQL语句 CREATE VIEW stock_view ASSELECT*FROM stock WHERE交易所=“深圳” 执行该语句后产生的视图包含的记录个数是 A: 1 B: 2 C: 3 D: 4

针对数据库S_T，以下创建视图的命令不正确的是（ ）。 A: create view view1asselect sno,avg(grade)from scgroup by sno B: create view view2asselect sno,sname,sdeptfrom studentwhere sdept='CS' C: create view view3asselect sno,sage+20from studentwhere ssex='女' D: create view view4asselect student.sno,sname,sc.sno,cno,grade from sc,studentwhere sc.sno=student.sno and cno='1'

如果length=3，则以下代码：<;view wx:if="{{length >; 5}}">;1<;/view>;<;view wx:elif="{{length >; 2}}">;2<;/view>;<;view wx:else>;3<;/view>;的输出结果为（ ） A: 1 B: 2 C: 3 D: 4

中国大学MOOC: 创建视图sale_item_view，该视图中包含订单编号、订货日期、图书编号及数量。可以使用以下SQL语句实现：create view sale_item_view（order_no，order_date，book_no，qty） asselect sales.order_no,sales.order_date,book_no,qtyfrom sales,sale_itemwheresales.order_no=sale_item.order_no

The more comprehensive and intuitive representation of the subject is _____. A: full face B: 3/4 view C: 2/3 view D: low angle potrait

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

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

通常使用（ ）语句删除视图 A: DROP VIEW B: DELETE VIEW C: ALTER VIEW D: CREATE VIEW

以下代码： <block wx:if="{{true}}"> <view>view1</view> <view>view2</view> </block> 的输出结果为