数据库上机实验学习记录
create table student(Sno char(9) primary key,Sname char(20) unique,Ssex char(2),Sage smallint,Sdept char(20));//查询select Sno,Sname,Ssex,Sage,Sdept from student where Sname='wy';//插入insert into student values('3','dh','v','12','jg');insert into student values('4','fg','n','45','sp');insert into student values('5','hg','n','25','dp');insert into student values('6','fg','v','55','ep');insert into student values('7','rg','n','66','tp');//删除delete Student where Sname='hg';//更新update student set Sname='zl' where Sname='fg' and Ssex='n';