zOs/SQL/LIKEESC

select name
    from sysibm.sysTables
    where name like '%\_%' escape '\' and type = 'T'
    fetch first 100 rows only
;
with d as
    ( select       'abcdef'    d from sysibm.sysdummy1
      union select 'ab_def'    d from sysibm.sysdummy1
      union select 'ab%def'    d from sysibm.sysdummy1
      union select 'ab\def'    d from sysibm.sysdummy1
    )
select *
    from d
    where d like '%\\%' escape '\'
    fetch first 100 rows only