title: How to update column records in database?
body: <p>I'm trying to update the records in a column within database. My current codes are as below:</p>
  
  <pre><code>curs = conn.cursor()
  statement='SELECT column FROM table'
  curs.execute(statement)
  curs.execute("INSERT INTO table VALUES (4, 'Five')")
  </code></pre>
  
  <p>In my understanding, the 4th row of the column should be updated to 'Five'. After I ran it, there is no error, but no update neither. There must be something wrong in my codes, or I'm missing something important. 
  What if I want to update the whole column's records? Thanks in advance for any clarification.</p>