建立一个供应商、零件数据库。其中“供应商”表S(Sno,Sname,Zip,City)分别表示:供应商代码、供应商名、供应商邮编、供应商所在城市,其函数依赖为:Sno→(Sname,Zip,City ),Zip→City。“零件”表P(Pno,Pname,Color,Weight,City),表示零件号、零件名、颜色、重量及产地。表S 与表P 之间的关系SP(Sno,Pno,Price,Qty)表示供应商代码、零件号、价格、数量。 a. “供应商”表S 属于 () 。 b. 若要求供应商名不能取重复值,关系的主码是Sno。请将下面的SQL 语句空缺部分补充完整。 CREATE TABLE S(Sno CHAR(5), Sname CHAR(30) () , Zip CHAR(8), City CHAR(20) () ); c. 查询供应“红”色零件,价格低于500,且数量大于200 的供应商代码、供应商名、零件号、价格及数量的SQL 语句如下: SELECT Sno,Sname,Pno,Price,Qty FROM S,SP WHERE Pno IN ( SELECT Pno FROM P WHERE () ) AND () ; City CHAR(20)()
A. NOT NULL
B. NOT NULL UNIQUE
C. PRIMARY KEY(Sno)
D. PRIMARY KEY(Sname)
查看答案
加入WTO,对我国的经济生活、社会生活乃至政治生活都将产生深刻的影响,并造成强大的冲击。所以,“入世”后,迫切要求我们转变政府职能,提高政府行政效率。 请问:在行政改革中,要提高政府行政效率,我们应从哪些方面进行改进,才能更好地应对WTO的挑战?请你联系实际加以论述。(不少于800字)
The Rational Unified Process (RUP) is a software engineering process, which captures many of best practices in modern software development. The notions of () and scenarios have been proven to be an excellent way to capture function requirements. RUP can be described in two dimensions – time and content. In the time dimension, the software lifecycle is broken into cycles. Each cycle is divided into four consecutive () which is concluded with a well-defined () and can be further broken down into () – acomplete development loop resulting in a release of an executable product, a subset of the final product under development, which grows incrementally to become the final system. The content structure refers to the disciplines, which group () logically by nature. The notions of () and scenarios have been proven to be an excellent way to capture function requirements.
A. artifacts
B. use-cases
C. actors
D. workers
在指令系统的各种寻址方式中,获取操作数最快的方式是()。若操作数的地址包含在指令中,则属于()方式。 在指令系统的各种寻址方式中,获取操作数最快的方式是()。
A. 直接寻址
B. 立即寻址
C. 寄存器寻址
D. 间接寻址
在我国每年一次的全国人民代表大会上,国务院总理需要向全国人民代表大会做政府工作报告,接受其监督,这体现了我国制度设计中()。
A. 公共责任制
B. 首长负责制
C. 宪政责任制
D. 对人民负责制