create table if not exists device
(
    id             serial       not null
        constraint device_pk
            primary key,
    name           varchar(256) not null,
    type           varchar(128) not null,
    specification  varchar(256),
    date_produced  date,
    date_install   date,
    date_guarantee date,
    date_mainten   date
);

comment on column device.specification is '规格
';

comment on column device.date_produced is '生产日期';

comment on column device.date_install is '安装日期';

comment on column device.date_guarantee is '质保期';

comment on column device.date_mainten is '维保期';

create unique index if not exists device_id_uindex
    on device (id);