-- Create table create table COURSE ( cno VARCHAR2(5) not null, cname VARCHAR2(20) not null, tno NUMBER not null ) tablespace USERS pctfree 10 initrans 1 maxtrans 255 storage ( initial 64K next 1M minextents 1 maxextents unlimited ); -- Add comments to the table comment on table COURSE is ‘课程表‘; -- Add comments to the columns comment on column COURSE.cno is ‘课程号(主键)‘; comment on column COURSE.cname is ‘课程名称‘; comment on column COURSE.tno is ‘教工编号(外键)‘;
时间: 2024-10-10 16:38:36