sample way

---
create table ger61(
id1 number(4),
name varchar2(22),
constraint ger61_id1_pk primary key (id1)
);
create table ger62(
id2 number(4),
id1 number(4),
name varchar2(22),
constraint ger61_id2_pk primary key (id2),
constraint ger62_id1_fk foreign key (id1) REFERENCES ger61 (id1)
);
--- 61 is department
insert into ger61 values (1, 'management');
insert into ger61 values (2, 'management1');
insert into ger61 values (3, 'management2');
--- 62 projects
insert into ger62 values (1, 2, 'bridge reconstruction');
insert into ger62 values (2, 2, 'street reconstruction');
insert into ger62 values (3, 2, 'HR');

---
---
(select g1.name
from ger61 g1)
minus
(
    select distinct g.name
    from ger61 g
        join ger62 g2 on (g2.id1 = g.id1)
    where exists (select distinct g2.id1
                    from ger62 g2
    )
);