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* Foreign key creation
@ 2001-04-21 15:14 edp <edp@elgi.jet.co.in>
2001-04-22 11:41 ` Re: Foreign key creation Oliver Elphick <olly@lfix.co.uk>
0 siblings, 1 reply; 2+ messages in thread
From: edp @ 2001-04-21 15:14 UTC (permalink / raw)
To: pgsql-docs
How to create foreign key in Posgresql.
regards
murali
^ permalink raw reply [nested|flat] 2+ messages in thread
* Re: Foreign key creation
2001-04-21 15:14 Foreign key creation edp <edp@elgi.jet.co.in>
@ 2001-04-22 11:41 ` Oliver Elphick <olly@lfix.co.uk>
0 siblings, 0 replies; 2+ messages in thread
From: Oliver Elphick @ 2001-04-22 11:41 UTC (permalink / raw)
To: edp <edp@elgi.jet.co.in>; +Cc: pgsql-docs
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
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========================================
"If my people, which are called by my name, shall
humble themselves, and pray, and seek my face, and
turn from their wicked ways; then will I hear from
heaven, and will forgive their sin, and will heal
their land." II Chronicles 7:14
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2001-04-21 15:14 Foreign key creation edp <edp@elgi.jet.co.in>
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