S(S#,SN,SEX,AGE,DEPT) C(C#,CN) SC(S#,C#,GRADE) 其中:S#为学号,SN为姓名,SEX为性别,AGE为年龄,DEPT为系别,C#为课程号, CN为课程名,GRADE为成绩。检索所有比“王华”年龄大的学生姓名、年龄和性别。正确的SELECT语句是 ___。A. SELECT SN,AGE,SEX FROM S WHERE AGE>(SELECT AGE FROM...
有三个表,即学生表 S、课程表 C 和学生选课表 SC,它们的结构如下:S(S#,SN,SEX,AGE,DEPT)C(C#,CN)SC(S#,C#,GRADE)其中,S#为学号,SN 为姓名,SEX 为性别,AGE 为年龄,DEPT 为系别,C#为课程 号,CN 为课程名,GRADE 为成绩。检索选修课程“C2”的学生中成绩最高的学生的学号。正确的 SELECT 语句...
The division bench of the high court comprising Chief Justice S. Manikumar and Justice Shaji P. Chali noted when certain issues with respect to the security of the state are concerned, the government is at liberty to decline to renew the permission granted, without disclosing the complete reaso...
Unfortunately due to the lack of field permits in the five boroughs, there will be no Fall season for the rest of the CSL along with the New York Metropolitan Women’s Soccer League who are entirely dependent on the New York Parks Dept. As a result the Shamrocks Over 30s have entered a...
对于关系模式S(Sno,Sname,Age,Dept);C(Cno,Cname,Teacher);SC(Sno,Cno,Score)下列查询结果相同的是( ) A
SC(S#,C#,GRADE)其中:S#为学号,SN为姓名,SEX为性别,AGE为年龄,DEPT为系别,C#为课程 号,CN为课程名,GRADE为成绩。 对表SC建立如下视图: CREATE VIEW S_GRADE(S#,C_NUM,AVG_GRADE) AS SELECT S#,COUNT(C#),AVG(GRADE) FROM SC GROUP BY S#。
Support the import and export request of other dept., be sure the freight can be arranged on time Maintain HS code and Country of Original in SAP system Focus on bonded business Other duties assigned by line manager Who You Are: You build and deliver solutions that meet customer ex...
16. HIIT and Department of Computer Science, University of Helsinki 17. Computer Science Department, University of California at Santa Cruz Authors Hiroshi Fujita (18) Miyuki Koshimura (18) Ryuzo Hasegawa (18) Author Affiliations 18. Dept. of Informatics, Kyushu University, Fukuoka, 819-...
例子数据库中有一个名为department的表,字段是dept_id, dept_name, dept_head_id。其定义如下: 注意每一字段都被指定为“not null”。这种情况下,表中每一记录的所有字段的数据都必填。 选择主键及外部键 主键是唯一识别表中每一项记录的字段。如何你的表已经正确标准化,主键应当成为数据库设计的一部分。