Question

I just want to track unique visitors for each article page.
I made a table with 2 fields. article_id as Primary key and ipas Unique

The expected output should be like :

article_id    *       IP
52            -  100.200.300.400
52            -  20.30.20.40
52            -  30.40.50.60
93            -  108.207.302.403
93            -  10.30.20.40

But it’s not working, this is what I get :

article_id    *       IP
52            -  100.200.300.400
93            -  10.30.20.40

I think I set the keys wrong.

Answer 1

When you define article_id as primary key, you will never have two records with the same article_id.

To avoid duplication of article_id + ip pairs, you can define a UNIQUE index of both fields: article_id AND ip.

For example:

CREATE  TABLE `visits` (
  `article_id` INT NOT NULL ,
  `ip` VARCHAR(15) NULL ,
  UNIQUE INDEX `unique_article_ip` (`article_id`, `ip`) )
ENGINE = MyISAM;