create or replace type "sysdba"."DelimitedTexts" is
OBJECT
(string varchar(4000));

create or replace type "sysdba"."DT" is
TABLE OF DelimitedTexts;

select sysdba.DT(sysdba.DelimitedTexts('501'),sysdba.DelimitedTexts('502'))

想实现这种：

select * from  t_sfk where skudm in ('501','502')

应该怎么实现呢？