数据库问题 请大佬帮忙解决 万分感谢

Question

将db2的函数转为mysql的函数CREATE OR REPLACE FUNCTION "DB2ADMIN"."GETASNOSBYPNOANDCNO" (pno varchar(10),cno varchar(1)) RETURNS table(as_nos varchar(2)) LANGUAGE SQL SPECIFIC SQL150907174255300 RETURN select as_nos from( select substr(as_nos,'1','1') as as_nos from mcm_xwprd_info where p_no=pno and ft_object=cno union select substr(as_nos,'3','1') as as_nos from mcm_xwprd_info where p_no=pno and ft_object=cno union select substr(as_nos,'5','1') as as_nos from mcm_xwprd_info where p_no=pno and ft_object=cno union select substr(as_nos,'7','1') as as_nos from mcm_xwprd_info where p_no=pno and ft_object=cno ) where as_nos !=''