Reference to uninitialized composite
尝试访问未通过构造函数调用初始化的对象类型变量的属性。
SELECT type_name, attr_name, attr_type_name FROM dba_type_attrs WHERE owner = 'SCHEMA' AND type_name = 'TYPE_NAME';SELECT object_name, status FROM dba_objects WHERE object_type = 'TYPE' AND owner = 'SCHEMA';