How to add a primary key to a MySQL table?

Question

This is what I tried but it fails:

alter table goods add column `id` int(10) unsigned primary AUTO_INCREMENT;

Does anyone have a tip?

Answer 1

Not sure if this matter to anyone else, but I prefer the id table to the first column in the database. The syntax for that is:

ALTER TABLE your_db.your_table ADD COLUMN `id` int(10) UNSIGNED PRIMARY KEY AUTO_INCREMENT FIRST;

Which is just a slight improvement over the first answer. If you wanted it to be in a different position, then

ALTER TABLE unique_address ADD COLUMN `id` int(10) UNSIGNED PRIMARY KEY AUTO_INCREMENT AFTER some_other_column;

HTH, -ft