"] < maxval1 and [:,"colname2"] > minval2 and [:,"colname2"] < maxval2 }</li>
<li>:,: { [:,"colname1"] > minval1 and [:,"colname1"] < maxval1 and [:,"colname2"] > minval2 and [:,"colname2"] < maxval2 }/:,"colname3"</li>
<li>:,: { ([:,"colname1"] > minval1 and [:,"colname1"] < maxval1) or ([:,"colname2"] > minval2 and [:,"colname2"] < maxval2) }/:,"colname3"</li>
<p>(the initial ":,:" is needed to ensure all columns are passed through to the next filter step)</p>

<h3>Return mean of column "colname3" for the