title: SQLite select where all columns are not null
body: <p>I have column1, column2, column3, column4, column5 and so on. </p>
  
  <p>If I know that one column is not null, I can use this query:</p>
  
  <pre><code>SELECT * 
  FROM table 
  WHERE columnA IS NOT NULL;
  </code></pre>
  
  <p>But now I want to select rows where all the columns are not null.</p>
  
  <p>How to write is query easily?</p>