如何创建可以使用group by with condition的LINQ to SQL请求?例如: group ri by new {groupByPackaging ?(ri.Model, ri.Condition, ri.Packaging) : (ri.Model, ri.Condition)} select new
我有数据帧,它最初是由2个数据帧- launches.merge(dropped,on=('id',how='left')建立的,因此我得到了 id name colour dropped2 K red 14 M red NaN6 K pink NaN where列从带有dropes(这是一个标志)的dataframe中删除,结果我想得到这样的dataframe name colour laun
我正在尝试建立一个使用python的助手。reg_ex = re.search('current weather in (.*)', command) city = reg_ex.group= location.condition()
TalkToMe('The Current weather in %s is %s.''The tempeture is %d.1 C degree' %(city
GroupBy(e => new { e.Date.Value.Year, e.Date.Value.Month, e.Date.Value.Day }).AsEnumerable().Select(group=> new entity c (Convert.ToInt32(group.Sum(x => x.Money)), Convert.ToInt32(group.Where(d => d.BillingType== 1).Sum(x => x.Money)),********what can i do h