【单选题】下列哪个答案是INT(-7.9)、CEILING(-7.9)和FLOOR(-7.9)的正确计算结果。
【单选题】If a sailing vessel with the wind on the port side sees a sailing vessel to windward and cannot tell weather the other vessel has the wind on the port or starboard side, she shall ______.
B.
sound the danger signal
C.
keep out of the way of the other vessel
D.
turn to port and come into the wind
【单选题】He did not write ,though he had
A.
careful enough;enough time
B.
carefully enough;enough time
C.
enough careful;enough time
D.
enough carefully;time enough
【单选题】不可以作为查询与视图的数据源的是( )。
【单选题】不可以作为查询与视图的数据源的是____________.
【简答题】下列哪个答案是INT(-7.9)、CEILING(-7.9)和FLOOR(-7.9)的正确计算结果。A)_8,-7,-8 B)-7,-7,-7 C)-7,-7,-8 D)-7,-8,-8
【单选题】Eventually he saved enough money____________at this trade on the side to buy his freedom.
【简答题】将答案填写上图中(7)、(8)处对应的传输介质;
【简答题】可以作为查询与视图的数据源是______。 A) 视图 B) 数据库表 C) 查询 D) A、B都可以
【单选题】关于查询与视图的说法,错误的是( )
D.
视图是完全独立的,它不依赖于数据库的存在而存在