title: Replace string in all columns of a SQLite database using one simple query
body: <p>Is it possible to replace a given string in all columns of a SQLite database using one simple query?</p>
  
  <p>Let's say I have a table with the four columns name, age, income and friends:</p>
  
  <pre><code>+------+-----+--------+---------+
  | name | age | income | friends |
  +------+-----+--------+---------+
  | John | 20  | 10     | 0       |
  +------+-----+--------+---------+
  | Jane | 25  | 20     | 0       |
  +------+-----+--------+---------+
  | June | 20  | 40     | 20      |
  +------+-----+--------+---------+
  </code></pre>
  
  <p>And I want to replace all instances of "20" with "40" in the whole table using one simple query. Something like:</p>
  
  <pre><code>UPDATE table SET ALL-COLUMNS = 40 WHERE ALL-COLUMNS = 20
  </code></pre>
  
  <p>Is this possible to achieve using SQLite? Or do I have to create one query for each column?</p>
  
  <pre><code>UPDATE table SET age = 40 WHERE age = 20
  UPDATE table SET income = 40 WHERE income = 20
  UPDATE table SET friends = 40 WHERE friends = 20
  </code></pre>