use KAMPUS

create table nilai
(nilaiid int PRIMARY KEY, namamatakuliah varchar (50), namamahasiswa varchar (50),
namadosen varchar (50), nilaiharian decimal (5,2), nilaiuts decimal (5,2), nilaiuas decimal (5,2),
FOREIGN KEY (namamahasiswa) REFERENCES mahasiswa(namamahasiswa),
FOREIGN KEY (namamatakuliah) REFERENCES matakuliah(namamatakuliah),
FOREIGN KEY (namadosen) REFERENCES dosen(namadosen)
)

Msg 1776, Level 16, State 0, Line 3
There are no primary or candidate keys in the referenced table ‘mahasiswa’ that match the referencing column list in the foreign key ‘FK__nilai__namamahas__6383C8BA’.
Msg 1750, Level 16, State 1, Line 3
Could not create constraint or index. See previous errors.