title: SQL: How to create table with case sensitive for unique key for utf8mb4_general_ci?
body: <p>I am using phpMyAdmin and PDO.
  My database using utf8mb4_general_ci.
  And look like this.</p>
  <pre><code>CREATE TABLE `my_database`.`example` (
      `id` INT NOT NULL AUTO_INCREMENT,
      `code` VARCHAR(255) NULL DEFAULT NULL,
      PRIMARY KEY (`id`),
      UNIQUE (`code`)
  ) ENGINE = InnoDB;
  </code></pre>
  <p>I got an error when I inserted 'A' and 'a'.
  I fix it by changing the Collation of the <code>code</code> column to utf8mb4_bin.</p>
  <p>Have any way to use utf8mb4_general_ci with sensitive cases?
  Can I set it in phpMyAdmin, PDO, or SQL?</p>