title: Writing sqlilte query for first converting dateString to date and performing a match with current date
body: <p>In my database table I have a column where <strong>date</strong> is stored as a <strong>string</strong>. Format is Jan 29, 2017. Now I want to retrieve all the row data of this table where current date is greater than the date stored. I should be first converting this column dateString to actual NSDate and then making a comparison with the current date, thereby retrieving all the row data. But I am getting no clue as to how actually write the query. Any help would be much appreciated.
  I am using sqlite.</p>