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Date: Sun, 26 Jun 2005 17:14:20 +0200
From: Mathieu Arnold <mat@mat.cc>
To: davide <site.webmaster@email.it>, pgsql-sql@postgresql.org
Subject: Re: multiple PK with a non UNIQUE field
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+-le 26/06/2005 16:58 +0200, davide =E9crivait :
| CREATE TABLE appalto (
|     cod_op         int     not null references Opere,
|     cod_com     int     not null references Opere,
|     scadenza     date     not null,
|     importo        int     not null,       PRIMARY KEY (cod_op,cod_com)
| );

You have to :
CREATE TABLE appalto (
    cod_op         int     not null,
    cod_com     int     not null,
    scadenza     date     not null,
    importo        int     not null,
    PRIMARY KEY (cod_op,cod_com),
    foreign key (cod_op,cod_com) references opere (cod_op,cod_com)
);

--=20
Mathieu Arnold