joining two tables using SUBSTR - response (3) by gerardo

Try this one:
 
sel * from tb1 a , tb2 b
where b.cntry_code like '%'||trim(a.cntry_code)||'%' ;

You will get these pairs:
a.cntry_code    b.cntry_code
FL                      FL,CHG,MN
DET                   DET
CHG                  FL,CHG,MN
MN                    FL,CHG,MN
MN                    MN,MN
 
 
Regards