语句select floor(3.14)和select ceil (3.14) 的执行结果是()。
A.3,3
B.4,4
C.3,4
D.4,3
A.3,3
B.4,4
C.3,4
D.4,3
第4题
A.DENY SELECT FROM 帐户 ON Jean
B.DENY UPDATE ON 帐户 TO Jean
C.DENY INSERT INTO 帐户 ON Jean
D.DENY UPDATE FROM 帐户 ON Jean
第5题
A.投影、选择运算
B.选择、投影运算
C.并、交运算
D.交、并运算
第6题
以系统管理员身份登录,创建账号tom,设置tom的默认表空间为neuspace。为tom分配connect和resource系统角色,获取基本的系统权限。然后为tom分配对用户scott的表emp的select权限和对SALARY, MGR属性的update权限。
第8题
FLOOR BROKERS, when a commission broker has (56) that he cannot execute personally because of their number or because of the activity of the market, he engages the services of a floor broker. These floor brokers were once referred to as $ 2 brokers, because at one time they charged a fee of $2 per (57) ; today this fee is (58) higher. Commissions are shared on these orders. It is easy to see that smaller commission brokers are especially prone to (59) by an influx of orders. The floor broker, as a freelance operator, provides a (60) function in ensuring that the exchange's business is conducted rapidly and efficiently.
(41)
A.commands
B.instructions
C.arrangements
D.orders
第9题
______of you left all those magazines strewn (撒落) on the floor like that?
A.Which
B.Who
C.What
D.Whoever
第10题
直径为2mm的导线由心阻率为3.14×10-3m的材料制成,当20A的电流均匀地流过该导体时,求导体内部的场强。
第11题
A. Next month. I’ve checked hydrants and fire-extinguishers on each floor
B.Next day. The manager will check hydrants and other equipment in the building.
C.Next week. But hydrants and fire extinguishers on each floor has already been checked
D.The day before yesterday. I had already checked hydrants and fire extinguishers on each floor.