Oracle level

with t as
(select 'a;b;c;d;e' as str from dual)
select level, t.str, substr(t.str, 2 * (level - 1) + 1, 1) as str_signle  from t
connect by
level <= length(t.str) - length(replace(t.str, ';', '')) + 1;

1   a;b;c;d;e   a
2   a;b;c;d;e   b
3   a;b;c;d;e   c
4   a;b;c;d;e   d
5   a;b;c;d;e   e

with t as
(select 'i;am;a;test;hahahhah' as str from dual)
select level, str, regexp_substr(t.str, '[^;]+', 1, level) str_single
from t
connect by level <= length(t.str) - length(replace(t.str, ';', '')) + 1;

1   i;am;a;test;hahahhah    i
2   i;am;a;test;hahahhah    am
3   i;am;a;test;hahahhah    a
4   i;am;a;test;hahahhah    test
5   i;am;a;test;hahahhah    hahahhah