zOs/SQL/LIKE

select
    case  when 'a' = 'a ' then '=' else '\' end "'a' = 'a '",
    case  when 'a' like 'a ' then 'like' else '\' end
                                      "'a' like 'a '",
    case  when 'a ' like 'a' then 'like' else '\' end
                                      "'a ' like 'a'"
  from sysibm.sysDummy1