//创建表,列的内容
-- Create table
create table T_HQ_PC
(
  pinpai     VARCHAR2(20) not null,
  xingh      VARCHAR2(40),
  jiage      NUMBER,
  chuchangrq DATE,
  shifoutc   CHAR(1)
)
tablespace TEST
  pctfree 10
  initrans 1
  maxtrans 255
  storage
  (
    initial 64K
    next 1M
    minextents 1
    maxextents unlimited
  );
//添加注释
-- Add comments to the columns 
comment on column T_HQ_PC.pinpai
  is ‘电脑品牌‘;
comment on column T_HQ_PC.xingh
  is ‘型号‘;
comment on column T_HQ_PC.jiage
  is ‘价格‘;
comment on column T_HQ_PC.chuchangrq
  is ‘出厂日期‘;
comment on column T_HQ_PC.shifoutc
  is ‘是否停产:1-是;2-否‘;
//创建主键约束
-- Create/Recreate primary, unique and foreign key constraints 
alter table T_HQ_PC
  add constraint PK_T_HQ_PC primary key (PINPAI)
  using index 
  tablespace TEST
  pctfree 10
  initrans 2
  maxtrans 255
  storage
  (
    initial 64K
    next 1M
    minextents 1
    maxextents unlimited
  );
//创建检查约束
-- Create/Recreate check constraints 
alter table T_HQ_PC
  add constraint CHECK_JIAGE
  check (jiage > 1000.00 and jiage < 60000.00);
alter table T_HQ_PC
  add constraint CHECK_SHIFOUTC
  check (shifoutc = ‘1‘ or shifoutc = ‘2‘);
原文:http://www.cnblogs.com/shadowduke/p/4909721.html