oracle 建表 練習2

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-- Create tablecreate 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 ‘課程表‘;-- Add comments to the columns comment on column COURSE.cno  is ‘課程號(主鍵)‘;comment on column COURSE.cname  is ‘課程名稱‘;comment on column COURSE.tno  is ‘教工編號(外鍵)‘;

oracle 建表 練習2

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