Question

请使用这个简单的E-sql查询帮助我：

var qStr = "SELECT SqlServer.Month(o.DatePaid) as month, SqlServer.Sum(o.PaidMoney) as PaidMoney FROM XACCModel.OrdersIncomes as o group by SqlServer.Month(o.DatePaid)";

这就是我所拥有的。

我有一个名为OrdersIncomes的简单实体，其ID,PaidMoney,DatePaid,Order_ID属性

我想像这样选择Month和Summed PaidMoney：

month  Paidmoney

1 500

2 700

3 1200

T-SQL looks like this and works fine:

    select MONTH(o.DatePaid), SUM(o.PaidMoney)
    from OrdersIncomes as o
    group by MONTH(o.DatePaid)

results:
-----------

3           31.0000

4           127.0000

5           20.0000

(3 row(s) affected)

但是E-SQL不起作用，我不知道该怎么做。这里我的E-SQL需要重构：

var qStr = "SELECT SqlServer.Month(o.DatePaid) as month, SqlServer.Sum(o.PaidMoney) as PaidMoney FROM XACCModel.OrdersIncomes as o group by SqlServer.Month(o.DatePaid)";

有一个例外：ErrorDescription =“标识符'o'无效，因为它不包含在聚合函数或GROUP BY子句中。”

如果我在group by子句中包含o，例如：FROM XACCModel.OrdersIncomes as o group by o 然后我没有得到总结和汇总的结果。这是一个错误，还是我做错了什么？

这是一个Linq to Entities查询，它也有效：

var incomeResult = from ic in _context.OrdersIncomes
     group ic by ic.DatePaid.Month into gr
     select new { Month = gr.Key, PaidMoney = gr.Sum(i => i.PaidMoney) };

Answer 1

为Group By子句指定别名，并在select子句中使用该别名。

选择 PaidMonth ，SqlServer.Sum（o.PaidMoney）作为PaidMoney 从XACCModel.OrdersIncomes as o 由SqlServer.Month（o.DatePaid）分组为 PaidMonth

实体Sql Group按问题，请帮忙

1 个答案: