title: SQL Query to find single letters in a string
body: <p>I need a SQL query that will select all of the single letters in a string eg:</p>
  
  <blockquote>
    <p>I am a string..</p>
    
    <p>I am another string..</p>
    
    <p>I am the third and fina l string..</p>
  </blockquote>
  
  <p>So this would find the first and last rows because they contain a single letter surrounded by spaces.</p>