SQL 使用 group / sum / having 查询 LINQ

Question

我一直在尝试将以下查询从 SQL 转换为 LINQ，我查询的主要目的是查找同一发件人的两个或多个交易，其中金额的总和 >= 2000

SELECT t.TXN_SENDER_ID,
       s.SEN_FIRSTNAME,
       s.SEN_LASTNAME,
       SUM(t.TXN_AMOUNT)
FROM   TRANSACTIONS t
INNER JOIN SENDERS s ON s.SEN_ID = t.TXN_SENDER_ID
WHERE  t.TXN_DATE BETWEEN Dateadd(YEAR, -3, Getdate()) AND Getdate()
GROUP  BY t.SENDER_ID, s.SENDER_NAME, s.SENDER_LASTNAME
HAVING SUM(t.TXN_AMOUNT) > 2000

这是我尝试过的方法：

var query = from t in context.TRANSACTIONS
            join s in context.SENDERS on t.TXN_SENDER_ID equals s.SEN_ID
            group new { t, s } by new { t.TXN_SENDER_ID, s.SEN_FIRSTNAME, s.SEN_LASTNAME, t.TXN_AMOUNT } into gr
            where (gr.Sum(x => x.t.TXN_AMOUNT) > 1000)
            select new { gr.Key.TXN_AMOUNT, gr.Key.SEN_FIRSTNAME, gr.Key.SEN_LASTNAME };

提前致谢

Answer 1

好的，您还没有回答我的问题，但是查看您的 sql 查询您想过滤 TXN_DATE 上的数据。我的最佳猜测：

DateTime dtFrom = DateTime.Today.AddDays(-3);
DateTime dtTo = DateTime.Today;

var query = from t in context.TRANSACTIONS
            .Where(tr=>tr.TXN_DATE>=dtFrom && tr.TXN_DATE<=dtTo)
            join s in context.SENDERS on t.TXN_SENDER_ID equals s.SEN_ID
            group new { t, s } by new { t.TXN_SENDER_ID, s.SEN_FIRSTNAME, s.SEN_LASTNAME, t.TXN_AMOUNT } into gr
            where (gr.Sum(x => x.t.TXN_AMOUNT) >= 2000)
            select new
            {
                gr.Key.TXN_SENDER_ID, 
                gr.Key.SEN_FIRSTNAME,
                gr.Key.SEN_LASTNAME,
                gr.Sum(a=>a.TXN_AMOUNT)
            };

SQL 使用 group / sum / having 查询 LINQ

SQL query to LINQ using group / sum / having

c#

linq

entity-framework

tsql

linq-to-entities