title: How to check if a value is a number in SQLite
body: <p>I have a column that contains numbers and other string values (like "?", "???", etc.)</p>
  
  <p>Is it possible to add an "is number" condition to the where clause in SQLite? Something like:</p>
  
  <pre><code>select * from mytable where isnumber(mycolumn)
  </code></pre>