From: Oliver Elphick <olly@lfix.co.uk>
To: edp <edp@elgi.jet.co.in>
Cc: 'pgsql-docs@postgresql.org' <pgsql-docs@postgresql.org>
Subject: Re: Foreign key creation
Date: Sun, 22 Apr 2001 12:41:21 +0100
Message-ID: <200104221141.f3MBfLU16722@linda.lfix.co.uk> (raw)
In-Reply-To: <edp@elgi.jet.co.in> <73010348951BD511B09E00A0C9ED2F0F08F747@ELGIMAIL>
edp wrote:
>How to create foreign key in Posgresql.
There are two ways, as shown below:
CREATE TABLE supplier (
id INTEGER PRIMARY KEY,
name TEXT
);
CREATE TABLE invoice (
invno SERIAL PRIMARY KEY,
supplier INTEGER NOT NULL
REFERENCES supplier(id)
ON UPDATE CASCADE
ON DELETE RESTRICT
DEFERRABLE,
...etc...
);
CREATE TABLE location (
id CHAR(2) PRIMARY KEY
name TEXT NOT NULL
);
CREATE TABLE supplier_location (
supplier INTEGER NOT NULL
REFERENCES supplier(id)
ON UPDATE CASCADE
ON DELETE RESTRICT
DEFERRABLE,
location CHAR(2) NOT NULL
REFERENCES location(id)
ON UPDATE CASCADE
ON DELETE RESTRICT
DEFERRABLE
);
CREATE TABLE delivery (
product VARCHAR(10),
supplier INTEGER,
location CHAR(2),
...etc...,
PRIMARY KEY (product, supplier, location),
FOREIGN KEY (supplier, location) REFERENCES supplier_location
ON UPDATE CASCADE
ON DELETE RESTRICT
MATCH FULL
DEFERRABLE
);
--
Oliver Elphick Oliver.Elphick@lfix.co.uk
Isle of Wight http://www.lfix.co.uk/oliver
PGP: 1024R/32B8FAA1: 97 EA 1D 47 72 3F 28 47 6B 7E 39 CC 56 E4 C1 47
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========================================
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their land." II Chronicles 7:14
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To: pgsql-docs@postgresql.org
Cc: olly@lfix.co.uk, edp@elgi.jet.co.in
Subject: Re: Foreign key creation
In-Reply-To: <200104221141.f3MBfLU16722@linda.lfix.co.uk>
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