mysql-error-1075

I'm changing my mysql db table from an id (auto) to a uid. ALTER TABLE companies DROP PRIMARY KEY; ALTER TABLE companies ADD PRIMARY KEY (`uuid`); This is the error I get.. [SQL] ALTER TABLE companies DROP PRIMARY KEY; [Err] 1075 - Incorrect table definition; there can be only one auto column and it must be defined as a key Which I understand, I need to change the id to a non-autoincrement because I drop it as the primary key.? What is the syntax to change a column to remove primary key and auto increment? ALTER TABLE companies change id id ?????????? int(11) Lauri Lehtinen If you need to

This works: CREATE TABLE shoutbox_shout ( shout_id INT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY, user_id INT UNSIGNED NOT NULL DEFAULT 0, shout_date INT UNSIGNED NOT NULL DEFAULT 0, message MEDIUMTEXT NOT NULL, KEY shout_date (shout_date) ) ...while this: CREATE TABLE shoutbox_shout ( shout_id INT UNSIGNED NOT NULL AUTO_INCREMENT, user_id INT UNSIGNED NOT NULL DEFAULT 0, shout_date INT UNSIGNED NOT NULL DEFAULT 0, message MEDIUMTEXT NOT NULL, KEY shout_date (shout_date) ) ...results in: Error Code: 1075 - Incorrect table definition; there can be only one auto column and it must be defined

Here is a table in MySQL 5.3.X+ db: CREATE TABLE members` ( `id` int(11) UNSIGNED NOT NULL AUTO_INCREMENT, `memberid` VARCHAR( 30 ) NOT NULL , `Time` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP , `firstname` VARCHAR( 50 ) NULL , `lastname` VARCHAR( 50 ) NULL , UNIQUE (memberid), PRIMARY KEY (id) ) ENGINE = MYISAM; Id column is never used in queries, it is just for visual convenience (so it's easy to see how the table grows). Memberid is an actual key, is unique, and memberid is used in queries to identify any member (WHERE memberid='abcde'). My question is: how to keep auto_increment, but

I have the following table schema which maps user_customers to permissions on a live MySQL database: mysql> describe user_customer_permission; +------------------+---------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +------------------+---------+------+-----+---------+----------------+ | id | int(11) | NO | PRI | NULL | auto_increment | | user_customer_id | int(11) | NO | PRI | NULL | | | permission_id | int(11) | NO | PRI | NULL | | +------------------+---------+------+-----+---------+----------------+ 3 rows in set (0.00 sec) I would like to