title: Structuring table to accept unique comments using PDO
body: <p>How do I structure my table so it will not accept double "same" comments from the same name for a particular post, while allowing a user to comment with the same comment and name under another post?</p>
  
  <p><code>$con-&gt;query("create table comment(id int(11) not null auto_increment, post_id varchar(20) not null, comment varchar(1000) not null, name varchar(20) not null, date datetime not null, primary key(id))");</code></p>