title: Is there OR operator in GQL?
body: <p>I don't know if this has been asked here. I saw couple of questions on "like" operator but I'm not sure if that's I'm looking for. Sorry I'm a noob at this. But I am moving from MySQL to Google App Engine and was wondering if there was an OR operator in GQL similar to ones in MySQL. </p>
  
  <p>Basically what I am trying to achieve is get the login on name via their username or email address. So my query would be something like this.</p>
  
  <pre><code>query = db.GqlQuery("SELECT * FROM mytable 
                       where username = :name 
                       OR email = :email 
                       AND password = :password",
                       name = user,
                       email = email,
                       password = pass1)
  </code></pre>
  
  <p>I realize that I can perform two queries and check each query for their successful completion and be able to achieve this but I am just wondering if there is already one available in GQL. </p>
  
  <p>Thanks.</p>