問題詳情
14)学生表中有 学号 姓名 和 年龄 三个字段,SQL语句SELECT 学号FROM 学生 完成的操作称
(A)选择
(B)投影
(C)连接
(D)并
(A)选择
(B)投影
(C)连接
(D)并
參考答案
答案:C
難度:適中0.5
統計:A(0),B(0),C(0),D(0),E(0)
內容推薦
- We lost our way in that small village, otherwise we more places of interest yesterday.(A) visite
- 31)查詢 教师表 的全部记录并存储于临时文件one.dbf中的SQL命令是(A)SELECT*FROM 教师表 INTO CURSOR one(B)SELECT*FROM 教师表TO CURSOR
- 22)为了隐藏在文本框中输入信息,用占位符代替现实用户输入字符,需要设置的属于是(A)value(B)controlsource(C)inputmask(D)passwordchar
- 13)计算机结果不是字符串 Teacher的语句是(A)a1(“Myteacher”,3,7)(B)substr(“Myteacher”,3,7)(C)right(“Myteacher”,7)(D)l
- 24.第二次世界大战后,日本政府解散财阀,资本占有结构出现明显变化。表2为日本不同所有者的分布状况(%) 对其解读有误的是 (A)政府实行自由放任经济政策 (B)股票市场对外开放程度有所提高 (C)金
- It is hard for the Greek government to get over the present difficulties it gets more financial
- 30)与 SELECT*FROM 教师表 INTO DBFA 等价的语句是(A)SELECT*FROM 教师表 TO DBFA(B)SELECT*FROM 教师表 TO TABLEA(C)SELECT
- 21) 以下关于 视图 的正确描述是(A)视图独立于表文件(B)视图不可更新(C)视图只能从一个表派生出来(D)视图可以删除
- 12)语句LIST MEMORY LIKE a* 能够显示变量不包括(A)a(B)a1(C)ab2(D)ba3
- 23.1912 年4 月,“秦坦尼克”号客轮在从英国到美国的首航中不幸沉没。某历史兴趣小组搜集了该客轮的背景材料,其中符合史实的是①使用电灯照明 ②豪华客舱配备电视 ③航线经过地中海 ④用无线电报与外
內容推薦
- 32)教师表中有 职工号;姓名;年龄;字段,其中 职工号;为主关键字,建立 教师表 的SQL语句命令是(A)CREATE TABLE 教师表(职工号 C(10)PRIMARY,姓名 C(20),工龄I
- ---Can you lend me the book Gone with the Wind?---Sorry, I returned it to the library just now. M
- The air quality in the city, is shown in the report, has improved over the past two months.(A) t
- 24)在数据库中建立表的命令式(A)vmefomn.display(B)vmeform.show(C)vmeform.list(D)vmeform.see
- 33)创建一个名为STUDENT 的新类 ,保存新类的类库名称是mylib,新类的父类是Person正确的命令式(A)CREATE CLASS mylib OF student As Person(B
- Nothing is so easy as parents to raise their expectations of their children too high.(A) of (B) t
- ---When did the computer crash?---This morning, while I the reading materials downloaded over the
- 34)”教师表”中又“职工号”、“姓名”、“工龄”和“系号”等字段,“学院表”中又“系名”和“系号”等字段,计算机 系教师总数的命令是(A)SELECT COUNT(*)FROM 教师表 INNER
- Pressed from his parents, and that he has wasted too much time, the boy is determined to stop pl
- ---Why do you choose to work in an international travel agency?---Well, you know, English is my .
- We promise attends the party a chance to have a photo taken with the movie star.(A) who (B) whom
- China has been pushing the reform of public hospitals all its citizens.(A) in charge of (B) for t
- I often read of incidents of misunderstanding or conflict. I’m left Why do these people create m
- 1 有一個已經退休的老先生,本來身體很硬朗,但不小心跌了一跤之後,不太能夠走路,他想申請補助在家裡的牆壁裝設幾個扶手。請問應是什麼單位負責此類業務:(A)衛生局(B)社會局(C)建設局(D)國宅處
- (A) parties (B) cities (C) villages (D) races
- (A) stated (B) ordered (C) decided (D) chose
- (A) why (B) which (C) how (D) when
- (A) attempts (B) instructions (C) opinions (D) arrangements
- Which of the following is TRUE about the donation to Tom?(A) The donation amounted to €190,0
- (A) together (B) around (C) alone (D) apart
- (A) anxiously (B) carelessly (C) disappointedly (D) fixedly
- It can be inferred from the passage that ______________(A) the donation is a rich old man(B)
- 25 . 2012 年 1 月 1 日起实施的(中华人民共和国行政强制法)规定,行政机关不得对居民生活采取停止供水、供电、供热、供热气等方式迫使当事人履行相关行政决定。这一规定(A)确立了法律的权成和
- (A) drop (B) throw (C) move (D) roll
- (A) familiarly (B) strangely (C) fully (D) coldly