title: How colSpan and row Span added to material table Header Angular 7?
body: <p>I'm trying to add <strong><code>rowSpan and colSpan</code></strong> in <strong><code>Angular material Table header</code></strong>. Can anyone help me to achieve  it.</p>
  
  <p>Below is the Attached Header I want to get using material table</p>
  
  <p><a href="https://i.stack.imgur.com/nDMBx.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/nDMBx.jpg" alt="enter image description here"></a></p>