SELECT ActivityTemplateID FROM ActivityScene GROUP BY ActivityTemplateID ORDER BY ActivityTemplateID DESC
order by 是需要放到group by 后面的,否则会报错
MVC中linq语句获取的时候,排序也是需要放到group by之后,才有效的。
List<Model> updateList = dbContext.Models.GroupBy(u=>u.ActivityPackageOrderID) .Select(u=>u.OrderByDescending(v=>v.ID).FirstOrDefault()).ToList();