#1025 - Error on rename of './database/#sql-2e0f_1254ba7' to './database/table' (errno: 150)

Question

So I am trying to add a primary key to one of the tables in my database. Right now it has a primary key like this:

PRIMARY KEY (user_id, round_number)
         


        

Answer 1

To bypass this in PHPMyAdmin or with MySQL, first remove the foreign key constraint before renaming the attribute.

(For PHPMyAdmin users: To remove FK constrains in PHPMyAdmin, select the attribute then click "relation view" next to "print view" in the toolbar below the table structure)