 
                    -- 养护
                    create table if not exists "road_maintenance"
                    (
                        id serial not null
                    );

                    create unique index if not exists road_maintenance_id_uindex
                        on road_maintenance (id);

                    alter table road_maintenance
                        add constraint road_maintenance_pk
                            primary key (id);
                
                        alter table road_maintenance add Serial_Number varchar(1024);
                        comment on column road_maintenance.Serial_Number is '序号';
                    
                        alter table road_maintenance add Responsible_Unit_For_Management_And_Maintenance varchar(1024);
                        comment on column road_maintenance.Responsible_Unit_For_Management_And_Maintenance is '管养责任单位';
                    
                        alter table road_maintenance add Maintenance_Unit varchar(1024);
                        comment on column road_maintenance.Maintenance_Unit is '养护单位';
                    
                        alter table road_maintenance add Management varchar(1024);
                        comment on column road_maintenance.Management is '管理人员';
                    
                        alter table road_maintenance add Worker varchar(1024);
                        comment on column road_maintenance.Worker is '工人';
                    
                        alter table road_maintenance add Public_Welfare_Post varchar(1024);
                        comment on column road_maintenance.Public_Welfare_Post is '公益岗位';
                    
                        alter table road_maintenance add County_Highway varchar(1024);
                        comment on column road_maintenance.County_Highway is '县道';
                    
                        alter table road_maintenance add Township_Road varchar(1024);
                        comment on column road_maintenance.Township_Road is '乡道  ';
                    
                        alter table road_maintenance add Village_Road varchar(1024);
                        comment on column road_maintenance.Village_Road is '村道';
                    
                        alter table road_maintenance add Bridge varchar(1024);
                        comment on column road_maintenance.Bridge is '桥梁                 ';
                    