title: How to concatenate strings with padding in sqlite
body: <p>I have three columns in an sqlite table:</p>
  
  <pre><code>    Column1    Column2    Column3
      A          1          1
      A          1          2
      A          12         2
      C          13         2
      B          11         2
  </code></pre>
  
  <p>I need to select <code>Column1-Column2-Column3</code> (e.g. <code>A-01-0001</code>). I want to pad each column with a <code>-</code></p>
  
  <p>I am a beginner with regards to SQLite, any help would be appreciated        </p>