title: Dual y axes in Google charts
body: <p>I am trying to use dual y axes with Google charts.I understand the basics and how it works.</p>
  <p>On one y axis, I want <code>BMI</code> values and on other <code>Weight</code> Values.</p>
  <p>I am taking out data from SQL database. However, <code>BMI</code> and <code>Weight</code> are itself values in a column called <code>ReadingName</code>.
  So, if I use the query,</p>
  <pre><code>select * from table where ReadingName = 'BMI' or ReadingName = Weight
  </code></pre>
  <p>I get the result set which is serialized into JSON and then forwarded to render charts which again would be retrieved using column Name only.</p>
  <p>Now, to have observation values for <code>BMI</code> on one yaxis and <code>Weight</code> on other, as per the example on GoogleCharts  website, I need to have them as columns.</p>
  <p>But I have them only as different  values of same column called <code>ReadingType</code>.Is there a work around possible ?</p>
  <p>This is how it should look like :
  <img src="https://i.stack.imgur.com/r4D7T.png" alt="enter image description here" /></p>