自定义复合类型

postgres=# create type my_type as (f1 int,f2 varchar(10));
CREATE TYPE

postgres=# create table t_my_type (f1 int,f_my_type my_type);
CREATE TABLE
postgres=# insert into t_my_type values(1,row(1,'tdsql_pg'));
INSERT 0 1
postgres=# select f1,(f_my_type).f2 from t_my_type;
 f1 |  f2  
----+-------
 1 | tdsql_pg
(1 row)