创建S表时,SNo使用CHAR(5)并且唯一,SName使用CHAR(30),Status使用CHAR(8),City使用CHAR(20)。请在下列用于创建表S的SQL语句空缺处填入正确的内容。
CREATE TABLE S(SNo CHAR(5),
SName CHAR(30),
Status CHAR(8),
City CHAR(20),
______;
创建S表时,SNo使用CHAR(5)并且唯一,SName使用CHAR(30),Status使用CHAR(8),City使用CHAR(20)。请在下列用于创建表S的SQL语句空缺处填入正确的内容。
CREATE TABLE S(SNo CHAR(5),
SName CHAR(30),
Status CHAR(8),
City CHAR(20),
______;
现有16枚外形相同的硬币,其中有一枚比真币的重量轻的假币,若采用分治法找出这枚假币,至少比较()次才能够找出该假币。
A.3
B.4
C.5
D.6
如下的SQL语句是书店用于查询“所有订购了bid为‘123-456’图书的用户订购其他图书的情况”的不完整语句,请在空缺处填入正确的内容。
Select bid
From Orderlist A
Where not exists(Select*from Orders B
where A.ordemum=B.ordemum and B.cid (3)
(Select cid from Ordcrlist C,Orders D
where (4).bid='123-456'
and (5)=D.ordemum))
根据ISO/IEC9126软件质量度量模型定义,一个软件的时间和资源质量子特性属于()质量特性。
A.功能性
B.效率
C.可靠性
D.易使用性
For neady ten years,the Unified Modeling Language(UML)has been the industry standardfor visualizing,specifying,constructing,and documenting the【S1】of a software-intensivesystem.As the【S2】standard modeling language,the UML facilitates communication andreduces confusion among project【S3】.The recent standardization of UML 2.0 has furtherextended the language’s scope and viability.Its inherent expressiveness allows users to【S4】everything from enterprise information systems and distributed Web·-based applications to real-timeembedded systems.The UML is not limited to modeling software.In fact,it is expressive enough to model【S5】systems,such as workflow in the legal system,the structure and behavior. of a patienthealthcare system,software engineering in aircraft combat systems,and the design of hardware.To understand the UML,you need to form. a conceptual model of the language,and this re—quires learning three major elements:the UML's basic building blocks,the rules that dictate howthose building blocks may be put together,and some common mechanisms that apply throughout theUML.
【S1】
A.classes
B.components
C.sequences
D.artifacts
函数调用时,基本的参数传递方式有传值与传地址两种,()。
A.在传值方式下,形参将值传给实参
B.在传值方式下,实参不能是数组元素
C.在传地址方式下,形参和实参间可以实现数据的双向传递
D.在传地址方式下,实参可以是任意的变量和表达式