Should I use LIMIT 1?

Question

MySQL

Do I need to use LIMIT 1 if, for example, it gets a post by id.

mysqli_query($connection, "SELECT * FROM `posts` WHERE `id` = '$id'");

or

mysqli_query($connection, "SELECT * FROM `posts` WHERE `id` = '$id' LIMIT 1");

Answer 1

if id is pk or it is unique then no