title: Database Matching Algorithm
body: <p>I am working on a system which will match members based on exact or/and closeness of their choice of product categories.</p>
  
  <p>For eg. Would suggest to a member other members whom have the same choice or likely or close selections.</p>
  
  <p>Eg. Fred selects (Cereals, Fruits, Beverages, Apparel)
  Mike selects (Cereals, Fruits)
  Jane selects  (Fruits, Beverages, Apparel)</p>
  
  <p>I want to match and suggest to Fred that a member Jane has categories in common</p>
  
  <p>Any pointers?</p>