title: sqlite vs postgreql in rails
body: <p>Quick questions, haven't been able to find concrete answers about this questions.  I'm guessing it's because the answer is obvious.</p>
  
  <p>I know that in order to push a rails app to Heroku a postgreql database is required.  I have only been working with the rails default database sqlite3.</p>
  
  <p>How different is postgreql?  Will I be able to make the same activerecord calls and queries that I do with a sqlite3 database with a postgresql database? </p>