var customers = _context.Customers.Join(_context.Products, cu => cu.id,
p => p.CustomerId, (cu,p) => new { cu,p})
.Select( c => new { prodId = c.p.Id,customername = c.cu.Name })
.OrderByDescending( c => c.prodId).Take(1);
在哪里安装其软件包?如何使用pub global activate
工具告诉我这些信息?