title: when i import database in mysql on server then getting a collations error message
body: <pre><code>CREATE TABLE `wp_commentmeta` (
  `meta_id` bigint( 20 ) UNSIGNED NOT NULL ,
  `comment_id` bigint( 20 ) UNSIGNED NOT NULL DEFAULT '0',
  `meta_key` varchar( 255 ) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_520_ci DEFAULT NULL ,
  `meta_value` longtext CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_520_ci
  ) ENGINE = InnoDB DEFAULT CHARSET = utf8mb4 COLLATE = utf8mb4_unicode_ci;
  </code></pre>
  <p>MySQL said: Documentation</p>
  <blockquote>
  <h1>1273 - Unknown collation: 'utf8mb4_unicode_520_ci'</h1>
  </blockquote>