title: Returning a boolean value in a case statement
body: <p>I am trying to return a boolean value from a case statement but the compiler is complaining about a ORA-00936: missing expression error:</p>
  
  <pre><code>SELECT
    CASE MYCOLUMN
       WHEN NULL THEN  true
    ELSE
         false
    END,
  FROM MYTABLE;
  </code></pre>
  
  <p>I also tried the following but it doesn't work:</p>
  
  <pre><code>SELECT
    CASE MYCOLUMN
       WHEN NULL THEN  SELECT true
    ELSE
         SELECT false
    END,
  FROM MYTABLE;
  </code></pre>
  
  <p>Is it possible to do this?</p>