关系代数运算是以（）为基础的运算。 -题库考试答案搜索网

关系代数运算是以（）为基础的运算。

单选题

2021-07-17 23:25

A、<span style=";font-family:宋体;font-size:14px">关系运算</span></p><p></p>
B、<span style=";font-family:宋体;font-size:14px">谓词演算 </span></p><p></p>
C、<span style=";font-family:宋体;font-size:14px">集合运算</span></p><p></p>
D、<span style=";font-family:宋体;font-size:14px">代数运算</span></p><p></p>

查看答案

正确答案

C

试题解析

标签：计算机网络技术高起专关系型数据库期末考试

感兴趣题目

The carrier is liable for loss of or damage to the goods or delay in delivery caused by fire，（）the claimant proves that the fire arose from fault or neglect on the part of the carrier，his servants or agents.

Shutdown price（or point，or rule）停业价格（或停业点、停业原则）

写出以下运算符代表信义：AND（），OR（）。

翻译：With Average or With Particular Average（WA or WPA）（）

Every deliberate act of wrongdoing by the master or any of the crew against the ship or cargo，without the authorization or privity of the Shipowner or his agent，is（）.

（）, or drum is used for hauling in or letting out the wires or ropes which will fasten the ship to the shore.

A salvor may be（）the whole or part of the payment due under Salvage Convention to the extent that the salvage operations have become necessary or more difficult because of fault or neglect on his part or if the salvor has been guilty of fraud or other dishonest conduct.

The （） is used for hauling in or letting out the wires or ropes.

Vessels must be（）valid certificate of nationality or certificated of registry or license.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

●设AND、OR和NOT分别表示按位与、按位或和按位求反运算，且X=10011011，Y=01111010，Z=11101000，则(NOT(X) AND Y)= (9) ， (Y OR NOT(Z))= (10) 。10011011011110101110100001100000(10)

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

相关题目: 关系代数运算是以（）为基础的运算。; boost的意思是:help or encourage to increase or improve; eloquent的意思是:fluent or persuasive in speaking or writing; Goods are carried by several of transport--on road or rail, by sea or air.; A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.; VisualBasic布尔运算符Xor，Or，Eqv，And中，级别最高的运算符是( )。; Visual Basic布尔运算符Xor，Or，Eqv，And中，级别最高的运算符是; 在CBMdisc中,优先级运算的逻辑运算是:()>AND>AND NOT>OR。; 关系代数运算是以（）为基础的运算。; 指令ORS功能，可实现多个指令块的“与”运算。; 关系代数运算是以（）为基础的运算。　　; 关系代数运算是以（）为基础的运算。; 由基本逻辑运算(AAND(NOT)B)OR((NOTA)ANDB)构成的复合运算称为（）运算。; Logistic回归系数与优势比OR的关系为（）。; 一项关于吸烟与肺癌关系的病例对照研究，研究结果表明OR为4.0，其意义是（）; 关系数据库的三种基本关系运算是(23)。在关系代数运算中，(24)运算结果的关系模式与原关系模式相同。; 已知A=40；B=30；C=100；D=50，逻辑“与”运算符为and，“或”运算符为or，“非”运算符为not。计算表达式A<>; 已知A=40；B=30；C=100；D=50，逻辑“与”运算符为and，“或”运算符为or，“非”运算符为not。计算表达式（A>B+20）or（B+60<>; Masters are（）solely responsible for all damages or accidents of whatever kind resulting from the navigating or handling of their vessels by day or by night.; 系统中雷达状态包括Unknown、Operational（or ON）、Failed（or OFF）、Detached。

广告位招租WX:84302438

题库考试答案搜索网

免费的网站请分享给朋友吧