the class of the work order with the fields number, month, technological operation, quantity, price, amount, worker calculate the number of technological operations per month for each worker

var operations = from wo in db.workorders
                 join w in db.workers
                 on wo.worker equals w.id
                 group jo by new { w.id, w.name} into g
                 select new {
                  id = g.Key.id,
                  name = g.Key.name,
                  operations = g.Count()
                };