title: How to setup PostGIS with an existing database?
body: <p>I have a database which has one table, Schools. This table also has latitude and longitude columns as 'float' type. I have installed PostGIS. I have created a postgis database using template_postgis_20. I, then added a table with datatype geometry. Now, how do I transfer latitude and longitude to this table from another Schools table? </p>
  
  <p>I am using this for a Django application. I need to make queries like find schools within 5 miles of a student's current location( latitude and longitude).</p>