Defining Composite Key with Auto Increment in MySQL

Question

Scenario:

I have a table which references two foreign keys, and for each unique combination of these foreign keys, has its own auto_increment column

Answer 1

Just add key(sr_no) on auto-increment column:

CREATE  TABLE `issue_log` (
 `sr_no` INT NOT NULL AUTO_INCREMENT ,
 `app_id` INT NOT NULL ,
 `test_id` INT NOT NULL ,
 `issue_name` VARCHAR(255) NOT NULL ,
  primary key (app_id, test_id,sr_no),
  key (`sr_no`)
);