select Student.Sno,Sname,Ssex,Cname,Grade from Student,SC,Co
select Student.Sno,Sname,Ssex,Cname,Grade from Student,SC,Co
select sname,avg(grade) from sc,student wherestudent.sno=sc.
范式的判断st(sno,sname,ssex,sage,sdept)c(cno,cname,cdept,tname)sc
insert into Student(Sno,Sname,Ssex,Sage,Sdept) values'95001'
SQL中表 Student(S#,Sname,Sage,Ssex) Course(C#,Cname,T#) 中的 S#
实验中的SQL部分 学生表:Student(Sno,Sname,Ssex,Sage,Sdept) 课程
WHERE S.Sno=SC.Sno AND Cname!="数据结构"GROUP BY Sname HAVING AV
有数据库 学生s(sno ,sname ,age ,sex) 成绩 sc(sno ,cno,grade) 课程 c(cn
String sql="update student set sname='"+name+"',ssex='"+sex+
这段文字的意思update student set grade = ( select grade from (
设有三个基本表S(S#,SNAME,AGE,SEX),SC(S#,C#,GRADE)和C(C#,CNAME,TEACHE
2、给出如下关系模式:Student(sno,sname,sex,sage,sdept,add(家庭住址)) Cours