title: how to find the constraint name of a column from table and drop it with a single query
body: <p>I need to find the constraint name of a column  and I need to delete it  with a single select statement  .
  if not possible then what is the alternative way </p>
  
  <p>I need to give this query to another person so that when he run the query it will automatically find the constraint name for the column for a particular table and then delete it .. without hard coded anything </p>