Querying for Not-Null values in Google App Engine can be done inApp Engine Admin Console by setting the equal-to query to the special value “None”. “None” is a special value in App Engine that lets you use the equals query operator to find entities with empty values for a property. To query for Not-Null values, go to the GAE Admin Console, click on the Datastore icon, and then click on the Query tab. Select the entity type you want to query from the Kind drop down. Then set the query filters. In the Property Field column, enter the property name you’re querying on. In the Query Operator column, select “=” (this assumes you’re looking for Not-Null values). Finally, in the Value column, enter “None”. Then click Run Query. The query results will display all entities that have a non-null value for the property you specified.
