Oracle创建Table以及对表的常用操作

1.Create Table

create table Course
(stu_id varchar2(20) not null,
 stu_name varchar2(20) not null,
 stu_course varchar2(20) not null,
 stu_score varchar2(10) not null
 )

2.Add column

alter table Course add check_time Date default sysdate;

3.Modify column

 alter table Course modify(field_name varchar2(20) defaults 'unknown')

4.rename column

alter table Course rename column field_name to new_field_name

5.delete column

alter table Course drop column col_name

6.grant

grant select on Course to public