oracle创建表，追加备注，添加主键，触发器，自动增长序列

create table T_WAREHOUSE
(
id NUMBER,
serial_num VARCHAR2(20),
name VARCHAR2(20),
fk_bigwarehouse_id NUMBER,
warehousetype VARCHAR2(20)
);

-- Add comments to the table
comment on table T_WAREHOUSE
is '仓库';
-- Add comments to the columns
comment on column T_WAREHOUSE.id
is '主键';
comment on column T_WAREHOUSE.serial_num
is '仓库编号';
comment on column T_WAREHOUSE.name
is '仓库名称';
comment on column T_WAREHOUSE.fk_bigwarehouse_id
is '大仓库外键编号';
comment on column T_WAREHOUSE.warehousetype
is '仓库类型（字典表）';

--主键
ALTER TABLE T_WAREHOUSE ADD CONSTRAINT PK_T_WAREHOUSE PRIMARY KEY (ID);


--自增序列 seq开头
create sequence SEQ_T_WAREHOUSE
minvalue 1
maxvalue 9999999999999999999
start with 1
increment by 1
cache 20;
--触发器 TG开头
CREATE OR REPLACE TRIGGER TG_T_WAREHOUSE BEFORE
insert ON T_WAREHOUSE FOR EACH ROW
begin
select SEQ_T_WAREHOUSE.nextval into:New.ID from dual;
end;