title: Select value of jsonb column in PostgreSQL
body: <p>I have a table 'Documents' which has a column 'Tags' with 'jsonb' datatype. 
  Sample data in Tags column </p>
  
  <pre><code> [{"Tag": "Social Media"}, {"Tag": "Adobe Creative"}]
   [{"Tag": "Interactive"}]
   [{"Tag": "Web 2.0"}, {"Tag": "Adobe Creative"},{"Tag": "Suite"}]
  </code></pre>
  
  <p>I need to get the distinct values of "Tag" like</p>
  
  <pre><code> Social Media 
   Adobe Creative
   Interactive
   Web 2.0
   Suite
  </code></pre>
  
  <p>I am new in PostgreSQL.</p>