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ALTER TABLE Ogrenciler
add constraint fk_cascade foreign key (DersId) references Dersler(DersId)
on update cascade
on delete cascade
delete from Dersler where DersId=1
delete from Ogrenciler where OgrenciId=1
select * from Ogrenciler
select * from Dersler
--SET NULL
--ana tablodaki kayıt güncellendiğinde yada silindiğinde diğer tablodaki karşılığı null olur
insert Ogrenciler values (1,'O','G')
insert Ogrenciler values (2,'B','Z')
ALTER TABLE Ogrenciler
add constraint FK_setnull foreign key (DersId) references Dersler(DersId)
on update set null
on delete set null
delete from Dersler where DersId=3
insert Dersler values('Türkçe')
insert Dersler values('Resim')
update Ogrenciler set DersId=3 where OgrenciId =12
select * from Ogrenciler
select * from Dersler
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