title: Concatenating same column values to single row using sql query
body: <p>I am having a requirement to Concatenate same column values to single row using sql query.
  Table A</p>
  
  <pre><code>TxnId   Sequence    Value
  111        1          A
  111        2         for
  111        3         Apple
  222        1         B-
  222        2         Ball
  333        1         C-Cat
  </code></pre>
  
  <p>Expected result</p>
  
  <pre><code>TxnId   Value
  111      A for Apple
  222      B- Ball
  333      C-Cat
  </code></pre>
  
  <p>Please help. I need to concatenate the value based on TxnId and sequence</p>