title: Comparison of Milliseconds in Maria DB Date Time
body: <p>DB: 10.5.13-MariaDB-log</p>
  <p><strong>Background</strong></p>
  <pre><code>Table : sample_table
  Column : create_at(datetime), another_column (varchar)
  </code></pre>
  <p>Several rows are already in it.</p>
  <p>Ex) create_at = 2022-07-29 07:19:09.0</p>
  <p><strong>Then</strong></p>
  <pre><code>SELECT *
  FROM sample_table
  WHERE create_at = ‘2022-07-29 07:19:09.1234’
  </code></pre>
  <p>Then return result 1 row.</p>
  <pre><code>SELECT *
  FROM sample_table
  WHERE create_at = ‘2022-07-29 07:19:09.1234’
  ORDER BY another_column;
  </code></pre>
  <p>Then return result 0 row;</p>
  <p>I don’t know why.
  Why difference return answers?</p>