title: how to import csv file which contain large set of data and have a column which has some null values
body: <p>mysql is removing those rows which contains null values but I want those.
  like i have a table</p>
  <pre><code>create table users
  (
      
      user_id int Not null primary key,
      created_at datetime not null,
      company_id int not null,
      language varchar(20) not null,
      activated_at datetime,
      state varchar(20) not null
  );
  </code></pre>
  <p><strong>activated_at</strong> is the only column which contains null values.</p>
  <p><a href="https://i.stack.imgur.com/7WDdz.png" rel="nofollow noreferrer">result</a>]<a href="https://i.stack.imgur.com/7WDdz.png" rel="nofollow noreferrer">1</a></p>
  <p><a href="https://i.stack.imgur.com/MOw60.png" rel="nofollow noreferrer">original data</a>]<a href="https://i.stack.imgur.com/MOw60.png" rel="nofollow noreferrer">2</a></p>