``` (select ID from t where GroupID == o.GroupID and ID > o.ID order by ID limit 1) IS NOT NULL ``` is the same as ``` exists (select ID from t where GroupID == o.GroupID and ID > o.ID order by ID limit 1) ```
``` (select ID from t where GroupID == o.GroupID and ID > o.ID order by ID limit 1) IS NOT NULL ``` is the same as ``` exists (select ID from t where GroupID == o.GroupID and ID > o.ID order by ID limit 1) ```