Linq: How to sort the SUM of one table and COUNT of another

Question

As in the previous question , I have the following LINQ expression.

Events.Where(Function(e) e.EventDate >= Date.Today) _
            .OrderByDescending(Function(e) (((e.EventVotes.Sum(Function(s) s.Vote)) * 2) + (e.Comments.Count))) _
            .Skip(0) _
            .Take(5)

What will be converted to the next SQL

-- Region Parameters
DECLARE @p0 DateTime2 = '2011-01-17 00:00:00.0000000'
DECLARE @p1 Int = 2
DECLARE @p2 Int = 0
DECLARE @p3 Int = 5
-- EndRegion
SELECT [t3].[ID], [t3].[UserID], [t3].[RegionID], [t3].[LocationID], [t3].[Title], [t3].[Description], [t3].[EventDate], [t3].[URL], [t3].[Phone], [t3].[TicketPriceLow], [t3].[TicketPriceHigh], [t3].[DatePosted], [t3].[isHighlighted]
FROM (
    SELECT ROW_NUMBER() OVER (ORDER BY (((
        SELECT SUM([t1].[Vote])
        FROM [dbo].[EventVotes] AS [t1]
        WHERE [t1].[EventID] = [t0].[ID]
        )) * @p1) + ((
        SELECT COUNT(*)
        FROM [dbo].[Comments] AS [t2]
        WHERE [t2].[EventID] = [t0].[ID]
        )) DESC) AS [ROW_NUMBER], [t0].[ID], [t0].[UserID], [t0].[RegionID], [t0].[LocationID], [t0].[Title], [t0].[Description], [t0].[EventDate], [t0].[URL], [t0].[Phone], [t0].[TicketPriceLow], [t0].[TicketPriceHigh], [t0].[DatePosted], [t0].[isHighlighted]
    FROM [dbo].[Events] AS [t0]
    WHERE [t0].[EventDate] >= @p0
    ) AS [t3]
WHERE [t3].[ROW_NUMBER] BETWEEN @p2 + 1 AND @p2 + @p3
ORDER BY [t3].[ROW_NUMBER]

My problem now is when it comes to ordering, when some events have no votes or comments.

This is what the EventVotes table looks like (whole)

| UserID | EventID | Vote |    
| 1      | 51      | 1    |   
| 1      | 52      | 1    |   
| 2      | 52      | 1    |   
| 1      | 53      | 1    |   
| 2      | 53      | -1   |   
| 3      | 53      | -1   |

The comment table is completely empty, since we just do Countit, we can assume that everything returns Null.

Now, when I run the query above, the order of the result is as follows

52
51
53
1
2
3

When should it be

52
51
1
2
3
53

53 "-1", 1, 2 3 "0"

- , Linq , ?

EDIT:

, LinqPad , .

Events.OrderByDescending(Function(e) (((e.EventVotes.Sum(Function(s) s.Vote)) * 2) + (e.Comments.Count)))

, orderby (51, 52, 53), . "" Lambda.

Answer 1

# . VB, VB ( , ) - , . , .

:

context.Events.OrderByDescending(e => (((e.EventVotes.Sum(s => (int?)s.Vote) ?? 0) * 2) + e.Comments.Count))

, s.Vote , Sum() , . null , .

VB ?? - # , () myNullableIntVar ?? 0 myNullableIntVar, null, 0.

SQL, , FWIW:

exec sp_executesql N'SELECT [t0].[EventID], [t0].[Name]
FROM [dbo].[Events] AS [t0]
ORDER BY ((COALESCE((
    SELECT SUM([t2].[value])
    FROM (
        SELECT [t1].[Vote] AS [value], [t1].[EventID]
        FROM [dbo].[EventVotes] AS [t1]
        ) AS [t2]
    WHERE [t2].[EventID] = [t0].[EventID]
    ),@p0)) * @p1) + ((
    SELECT COUNT(*)
    FROM [dbo].[Comments] AS [t3]
    WHERE [t3].[EventID] = [t0].[EventID]
    )) DESC',N'@p0 int,@p1 int',@p0=0,@p1=2

---

rockinthesixstring

VB.NET - , . DirectCast(s.Vote, Integer?), , , Integer Integer?. .

Events.OrderByDescending(Function(e) (((If(e.EventVotes.Sum(Function(s) s.Vote),
                                           e.EventVotes.Sum(Function(s) s.Vote),
                                           0)) * 2) + e.Comments.Count))

SQL Query

-- Region Parameters
DECLARE @p0 Int = 0
DECLARE @p1 Int = 2
-- EndRegion
SELECT [t0].[ID], [t0].[UserID], [t0].[RegionID], [t0].[LocationID], [t0].[Title], [t0].[Description], [t0].[EventDate], [t0].[URL], [t0].[Phone], [t0].[TicketPriceLow], [t0].[TicketPriceHigh], [t0].[DatePosted], [t0].[isHighlighted]
FROM [dbo].[Events] AS [t0]
ORDER BY ((
    (CASE 
        WHEN (CONVERT(Bit,(
            SELECT SUM([t1].[Vote])
            FROM [dbo].[EventVotes] AS [t1]
            WHERE [t1].[EventID] = [t0].[ID]
            ))) = 1 THEN (
            SELECT SUM([t2].[Vote])
            FROM [dbo].[EventVotes] AS [t2]
            WHERE [t2].[EventID] = [t0].[ID]
            )
        ELSE @p0
     END)) * @p1) + ((
    SELECT COUNT(*)
    FROM [dbo].[Comments] AS [t3]
    WHERE [t3].[EventID] = [t0].[ID]
    )) DESC