 conditionally select some of them. Suppose we
know our targetted table has columns:
</p>

<p>
'id 'name 'salary 'start-date 'city 'region 'age.
</p>

<p>
We may decide we always want name, city and age, but salary and start-date are
conditional.
</p>

<div class="org-src-container">
<pre class="src src-lisp">(<span style="color: #00ffff;">defun</span> <span style="color: #63b8ff;">toy-example-2</span> (salaryp start-date-p)
  (sql-compile
   (remove nil `(<span style="color: #98fb98; font-weight: bold;">:s