Question

此查询会将两列列为当前月份的用户ID列和总销售额的列。

我需要添加一个对它们进行排名的列（它与行＃完全相同）

我需要将它从SQL转换为LINQ或Lambda。

select pu.userID, SUM(o.OrderTotal) as OrderTotal from ProPit_User pu
inner join SeperateDB.dbo.orders o on pu.salesrepid = o.salesrepid and o.DateCompleted > '2014-05-01' and o.DateCompleted < '2014-05-23'
group by pu.userID
order by SUM(o.OrderTotal) desc

目前返回：

userID  OrderTotal
340 68992.74
318 49575.05
228 42470.88
278 38196.87
291 36220.52
351 34962.32
422 31764.67
178 31433.41
430 30836.77
212 30375.99

Answer 1

要使用SQL捕获排名索引，您只需修改当前的sql：

     SELECT pu.userid, 
            SUM(o.OrderTotal) AS OrderTotal, 
            ROW_NUMBER() OVER (ORDER BY SUM(o.ordertotal) DESC) AS [Rank]
       FROM ProPit_User pu
 INNER JOIN SeperateDB.dbo.Orders o ON pu.salesrepid = o.salesrepid 
        AND o.DateCompleted > '2014-05-01' AND o.DateCompleted < '2014-05-23'
   GROUP BY pu.userid
   ORDER BY SUM(o.OrderTotal) DESC

将产生

userID  OrderTotal Rank
340     68992.74   1
318     49575.05   2
228     42470.88   3
etc

不确定您希望在哪种情况下转换为LINQ＆＃39;。如果你的意思是对EF或Linq-to-Sql上下文中的这两个表进行linq查询，那么这些语句将产生与上面相同的结果：

var minDate = new DateTime(2014,5,1);
var maxDate = new DateTime(2014,5,23);

-- the linq to sql query:
-- join on salesrepid, group by userid, sum the ordertotals
var dbQuery = ProPit_Users.GroupJoin(
 Orders,
 pu => pu.salesrepid,
 o => o.salesrepid,
 (pu, orders) => new 
    {
      pu.UserId, 
      OrderTotal = orders.Where(o => o.datecompleted > minDate && o.datecompleted. < maxDate )
                         .Sum(o => o.ordertotal)
    }
 )
 .OrderByDescending(row => row.OrderTotal)
 -- materialize the db query
 .ToList();

 -- add ranking to the results of the query
 var userRankings = dbQuery.Select((row, idx) => new { Rank = ++idx, row.UserId, row.OrderTotal });

将产生一个对象列表：

Rank UserID  OrderTotal
1    340     68992.74  
2    318     49575.05  
3    228     42470.88  
etc

需要将此查询转换为linq或lambda

1 个答案: