Oracle建表

-- Create table
create table T_HQ_XS
(
xueh   VARCHAR2(10) not null,
xingm  VARCHAR2(20) not null,
xingb  CHAR(1) default '1',
nianl  NUMBER,
zhuany VARCHAR2(20)
)

-- Add comments to the columns
comment on column T_HQ_XS.xueh
is '学号';
comment on column T_HQ_XS.xingm
is '姓名';
comment on column T_HQ_XS.xingb
is '性别 1-男,2-女';
comment on column T_HQ_XS.nianl
is '年龄';
comment on column T_HQ_XS.zhuany
is '专业';
-- Create/Recreate primary, unique and foreign key constraints
alter table T_HQ_XS
add constraint PK_T_HQ_XS primary key (XUEH)

-- Create/Recreate check constraints
alter table T_HQ_XS
add constraint CHECK_T_HQ_XS_NIANL
check (NIANL > 8 AND NIANL < 50);
alter table T_HQ_XS
add constraint CHECK_T_HQ_XS_XINGB
check (XINGB = '1' OR XINGB = '2');