title: Query to find distance between a point column and a point in PostGis
body: <p>I am using PostGis for Location based calculations in my Application. In a Table i have a column called 'location' in geography type(Point(lon lat))...Like this number of rows present in the Table.
  I want to pass a point(Point(lon lat))  and check distance between this point(i passed) and location column in all rows....and if distance is less than 5 m....it will return the name of the point.How to query this.</p>