ical. Should count variables be returned when
using aggregation.</p></dd>


<dt id="arg-exclude-na">exclude_na<a class="anchor" aria-label="anchor" href="#arg-exclude-na"></a></dt>
<dd><p>Logical. Should records where all selected variables have
non-NA values only be returned.</p></dd>


<dt id="arg-unlist">unlist<a class="anchor" aria-label="anchor" href="#arg-unlist"></a></dt>
<dd><p>Logical. Should variables that contain non atomic data be
concatenated into a string separated by ";"?</p></dd>


<dt id="a