I think that KEY is the same as INDEX, but why UNIQUE?
----- Original Message -----
From: TJ Hunter <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Monday, February 12, 2001 3:49 AM
Subject: indexing unique fields
> I'm using the following table to store information about a merchant user.
> He uses his email address as his username to login. Since I'm going to
> be doing WHERE clauses on that field, I'd like it to be indexed for speed.
> If I have a UNIQUE property on the email field when I create the table, do
I
> need the "INDEX (email)" line in there or since the email field is UNIQUE,
> it's automatically indexed?
>
> CREATE TABLE merchants (
> id INT UNSIGNED NOT NULL AUTO_INCREMENT,
> name CHAR(64) NOT NULL,
> contact CHAR(64),
> address CHAR(64),
> city CHAR(64),
> stateId INT UNSIGNED,
> zipcode CHAR(11),
> phone CHAR(15),
> fax CHAR(15),
> email CHAR(64) NOT NULL UNIQUE,
> password CHAR(64) NOT NULL,
>
> PRIMARY KEY (id),
> INDEX (email)
> );
>
>
>
> This question came up when I did a dump on the table and got the output
below.
> There is a 'KEY email_2 (email)' line that is throwing me off.
>
> CREATE TABLE merchants (
> id int(10) unsigned NOT NULL auto_increment,
> name char(64) NOT NULL,
> contact char(64),
> address char(64),
> city char(64),
> stateId int(10) unsigned,
> zipcode char(11),
> phone char(15),
> fax char(15),
> email char(64) NOT NULL,
> password char(64) NOT NULL,
> PRIMARY KEY (id),
> UNIQUE email (email),
> KEY email_2 (email)
> );
>
>
>
>
>
>
> -TJ Hunter
>
>
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