Question

I am having a problem with creating SQL table with composite and primary keys in it. This is what I have for now:

CREATE TABLE Racunar (
  IPAdresa char(15) PRIMARY KEY,
  CPU char(20),
  HD char(20)
);

CREATE TABLE Program (
  Naziv char(15),
  Verzija char(20),
  Datum char(11),
  PRIMARY KEY(Naziv, Verzija)
);

CREATE TABLE Operater (
  SifO int PRIMARY KEY,
  Ime char(20),
  BrTel char(20)
);

CREATE TABLE JeInstaliran (
  IPAdresa char(15) FOREIGN KEY REFERENCES Racunar(IPAdresa),
  SifO int FOREIGN KEY REFERENCES Operater(SifO),
  FOREIGN KEY(Naziv, Verzija) REFERENCES Program(Naziv, Verzija),
  DatumInstalacije char(11)
);

The problem is somewhere in the last table. I am using SQL Fiddle and it returned the next error message after trying to build schema:

Schema Creation Failed: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the
right syntax to use near ‘FOREIGN KEY REFERENCES Racunar(IPAdresa),
SifO int FOREIGN KEY REFERENCES Oper’ at line 2:

I don’t know why this doesn’t work, so I would appreciate any help. Thanks in advance.

Answer 1

The syntax is incorrect. Instead of defining the FOREIGN KEY along with the column, define it after the column definition using the syntax FOREIGN KEY (colname) REFERENCES tablename (foreign_colname)

CREATE TABLE JeInstaliran (
  IPAdresa char(15),
  SifO int,
  Naziv char(15),
  Verzija char(20),
  FOREIGN KEY (IPAdresa) REFERENCES Racunar(IPAdresa),
  FOREIGN KEY (SifO) REFERENCES Operater(SifO),
  FOREIGN KEY(Naziv, Verzija) REFERENCES Program(Naziv, Verzija),
  DatumInstalacije char(11)
);