创建自定义类型create type room_capacity_type as object(auditorium_setting integer,table_setting integer,standing_room_setting integer)
表中使用create table t4(lot room_capacity_type)
插入值insert into t4(lot) values(room_capacity_type(10,10,10));
访问select a.lot.auditorium_setting,a.lot.table_setting,a.lot.standing_room_setting from t4 a;
