title: Selecting distinct values for multiple columns in Single Row
body: <p>I have a SQL table called "calculation" that looks like this:</p>
  
  <pre><code>id | InsulationMaterialId1 | InsulationMaterialId2| InsulationMaterialId3 | InsulationMaterialId4
  -----------------------
  1  | 34 | 45 | 34 | 50
  2  | 34 | 78 | 35 | 51
  3  | 35 | 32 | 34 | 52
  4  | 36 | 30 | 34 | 53
  5  | 40 | 39 | 34 | 34
  6  | 41 | 34 | 34 | 56
  7  | 42 | 36 | 34 | 53
  </code></pre>
  
  <p>In these table , we have 4 columns with insulation ids , I want to get unique insulation ids in one single column with ',' separated means Output like this :-</p>
  
  <pre><code> id | InsulationMaterialIds 
  -----------------------
  1  | 34,45,50
  2  | 34,78,35,51
  3  | 35,32,34,52
  4  | 36,30,34,53
  5  | 40,39,34
  6  | 41,34,56
  7  | 42,36,34,53
  </code></pre>