title: google app engine datastore Go Query with "in" operator
body: <p>Using Query in App Engine Datastore, how do I specify to fetch keys that match a property with variable values?</p>
  
  <pre><code>var Person struct {
     name string
     department string  
  }
  
  //Query
  q := datastore.NewQuery("Person").Filter("department = ", "department1").KeysOnly()
  </code></pre>
  
  <p>In the above query, instead of <strong>"="</strong> operator, I want "IN" operator to specify more than 1 department value i.e fetch all person keys who belong to department1, department2, department3 etc.</p>
  
  <p>Is this possible with 1 Query? Or do I need to make 1 query for each department?</p>