Create Foreign Keys between two Schemata

Question

Hello,
I use Oracle 10g and I trying to create a ForeignKey constraint between two tables in different schemata.
This is my DDL-Script
SQL> CREATE TABLE PROJECT.LOCATION (
ID INTEGER NOT NULL,
MAIN INTEGER,
KURZ VARCHAR(40),
NAME VARCHAR(40),
STRASSE VARCHAR(40),
ORT VARCHAR(40),
TELEFON VARCHAR(40),
FAX VARCHAR(40),
EMAIL VARCHAR(40),
PLZ VARCHAR(40),
CONSTRAINT PK_LOCATION PRIMARY KEY (ID)
Tablespace PROJECT;
CREATE TABLE Diary.Diary (
ID INTEGER NOT NULL,
LOCATION_ID INTEGER NOT NULL,
CONSTRAINT PK_Diary PRIMARY KEY (ID)
Tablespace Diary;
ALTER TABLE Diary.Diary
ADD CONSTRAINT FK_Diary_Has_LOCATION
FOREIGN KEY (LOCATION_ID) REFERENCES PROJECT.LOCATION (ID);
This is the Message that gives my SQLplus :
SQL> ALTER TABLE Diary.Diary
2 ADD CONSTRAINT FK_Diary_Has_LOCATION
3 FOREIGN KEY (LOCATION_ID) REFERENCES PROJECT.LOCATION (ID);
FOREIGN KEY (LOCATION_ID) REFERENCES PROJECT.LOCATION (ID)
FEHLER in Zeile 3:
ORA-00942: Tabelle oder View nicht vorhanden
All Grants (select,alter,references) are given to the User for the tables.
Whats then Problem?

Answer 1

You miss some priviledge:
SQL> create user project identified by project;
Utente creato.
SQL> grant connect, resource to project;
Concessione riuscita.
SQL> create user diary identified by diary;
Utente creato.
SQL> grant connect, resource to diary;
Concessione riuscita.
SQL> CREATE TABLE PROJECT.LOCATION (
  2  ID INTEGER NOT NULL,
  3  MAIN INTEGER,
  4  KURZ VARCHAR(40),
  5  NAME VARCHAR(40),
  6  STRASSE VARCHAR(40),
  7  ORT VARCHAR(40),
  8  TELEFON VARCHAR(40),
  9  FAX VARCHAR(40),
10  EMAIL VARCHAR(40),
11  PLZ VARCHAR(40),
12  CONSTRAINT PK_LOCATION PRIMARY KEY (ID)
13  )
14  ;
Tabella creata.
SQL> CREATE TABLE Diary.Diary (
  2  ID INTEGER NOT NULL,
  3  LOCATION_ID INTEGER NOT NULL,
  4  CONSTRAINT PK_Diary PRIMARY KEY (ID)
  5  )
  6  ;
Tabella creata.
SQL> ALTER TABLE Diary.Diary
  2  ADD CONSTRAINT FK_Diary_Has_LOCATION
  3  FOREIGN KEY (LOCATION_ID) REFERENCES PROJECT.LOCATION (ID);
FOREIGN KEY (LOCATION_ID) REFERENCES PROJECT.LOCATION (ID)
ERRORE alla riga 3:
ORA-00942: tabella o vista inesistente
-- DIARY CAN'T SEE PROJECT.LOCATION
SQL> grant select on project.location to diary;
Concessione riuscita.
SQL> ALTER TABLE Diary.Diary
  2  ADD CONSTRAINT FK_Diary_Has_LOCATION
  3  FOREIGN KEY (LOCATION_ID) REFERENCES PROJECT.LOCATION (ID);
FOREIGN KEY (LOCATION_ID) REFERENCES PROJECT.LOCATION (ID)
ERRORE alla riga 3:
ORA-01031: privilegi insufficienti
-- DIARY CAN SEE PROJECT.LOCATION BUT CAN'T REFERENCE IT
SQL> grant references on project.location to diary;
Concessione riuscita.
SQL> ALTER TABLE Diary.Diary
  2  ADD CONSTRAINT FK_Diary_Has_LOCATION
  3  FOREIGN KEY (LOCATION_ID) REFERENCES PROJECT.LOCATION (ID);
Tabella modificata.
-- NOW IT'S ALL OK!!Max
[My Italian Oracle blog|http://oracleitalia.wordpress.com/2009/12/18/table-elimination-oppure-join-elimination-lottimizzatore-si-libera-della-zavorra/]