Hello, In a simple case, suppose i have two kinds (tables) stored in GAE datastore:
Employee (EmployeeId, Name, Salary, StartDate, DepartmentId) Department(DepartmentId, DepartmentName) For Employee kind, EmployeeId is the unique key and DepartmentId is the join attribute for Employee to make join with Department kind. For Department kind, DepartmentId is the unique key. Both Employee and Department kinds have quite a lot of tuples, let us say, more than 3 million tuples. There is a need to make join query over both Employee and Department kinds in order to answer the query concerns the data from both kinds. For example a query could be "List all employees's Id, name, salary and their department name for the ones earns more than 8000 US dollar". How can i make join query among different kinds to answer the query concerns different kinds? Of course, there could be more than just two kinds stored in GAE datastore. If one wants to make join query among more than two kinds, how to handle that? Thank you for your help! Bruce -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to google-appengine@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
