petchimuthu lingam wrote:
> If i create foreign key references, whether it will improve the
> performance in the select query?
Foreign keys are used to create integrity in the database, it won't
affect select performance.
eg:
create table users (
userid int primary key,
username text
);
create table news (
newsid int primary key,
created_by int references users(userid)
);
That means that a news item cannot be created by a userid that doesn't
exist.
http://www.postgresql.org/docs/current/interactive/tutorial-fk.html
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