sql oracle, ALTER TABLE error

Question

Here is ERD model of my DB:

Here is create table codes i used so far: pastebin

I have created all tables and now I'm trying to alter them to create foreign keys,
but this alter doesn't work.

Alter table uskladnena_surovina add  foreign key  (datum_spotreby,id_dodavatela,id_suroviny) references ponukana_surovina    (datum_spotreby,id_dodavatela,id_suroviny) 
/

It says:

"DATUM_SPOTREBY": 
00904. 00000 -  "%s: invalid identifier"

Answer 1

You need to tell Oracle that you want to create a constraint. To do this, you need to specify add constraint after alter table ... . If you don't tell Oracle what you want to add to the table, it assumes you want to add a new column.

Try

Alter table uskladnena_surovina add constraint constraint_name foreign key  (datum_spotreby,id_dodavatela,id_suroviny) references ponukana_surovina    (datum_spotreby,id_dodavatela,id_suroviny) 

/

You also have to give the constraint a name. Feel free to change constraint_name .

Answer 2

哦对不起伙计们，我忘了将datum_Spotreby添加到uskladnena_surovina，所以显然它无法工作，现在它的工作原理