title: Query to combine 2 column into 1 from same table
body: <p>How can I write a query from table <code>MDCCategories</code>to combine column <code>MDC</code> and <code>MDCText</code> into 1 column seperated by a hyphen "<code>-</code>"? Here is the table struct:</p>
  
  <p><img src="https://i.stack.imgur.com/EqmCi.png" alt="enter image description here"></p>
  
  <p>Please, let me know if my question is unclear.</p>