mysql - SQL retrieving highest number from each group -

i have mysql-table, containing these data:

idpk    groupidfk  1          1  2          1  3          2  4          2  5          1 

i'm looking way group 2nd column values , display highest value first column in group. in case, should return these entries:

idpk     groupidfk  5          1  4          2 

does description make sense? , if so, can please me out?

this query rows sorted groupidfk:

select max(idpk) idpk, groupidfk table group groupidfk; 

if need order idpk below version:

 select max(idpk) idpk, groupidfk table group groupidfk order idpk desc;