我有一个有点复杂的 linq2sql 查询,它不包含任何“order by”语句,但不知何故 linq2sql 认为它是必要的并插入它。不幸的是,这个“order by”语句会影响性能,我不知道如何删除它......
这是 linq2sql 表达式(我不认为它们可能有帮助,但无论如何......)
var lockedBy = Guid.NewGuid();
var locks = LinqDataContext.Instance.LockBranches(3, lockedBy, DateTime.Now + TimeSpan.FromMinutes(3)); // Stored procedure...
var x = LinqDataContext.Instance.Branches
.Where(branch => branch.LockedBy == lockedBy)
.Select
(
branch => new
{
Branch = branch,
Leaves = branch.Leaves
.Select
(
leaf => new
{
Leaf = leaf,
Estimate = leaf.Representation.Estimates
.GroupBy(estimate=>estimate.SegmentID)
.Sum
(
estimatesBySegment => estimatesBySegment.Average
(
estimate => estimate.EstimateRequests.Average
(
estimateRequest => estimateRequest.EstimateSubmit.Value
)
)
)
}
)
}
);
它呈现为以下 sql
SELECT [t0].[ID], [t0].[IndexID], [t0].[IndexNo], [t0].[Sealed], [t0].[LockedBy], [t0].[UnlockOn], [t1].[ID] AS [ID2], [t1].[BranchID], [t1].[RepresentationID], [t1].[Xml], (
SELECT SUM([t7].[value])
FROM (
SELECT AVG([t6].[value]) AS [value]
FROM (
SELECT (
SELECT AVG([t5].[Value])
FROM [dbo].[EstimateRequests] AS [t4]
LEFT OUTER JOIN [dbo].[EstimateSubmits] AS [t5] ON [t5].[EstimateRequestID] = [t4].[ID]
WHERE [t4].[EstimateID] = [t3].[ID]
) AS [value], [t2].[ID], [t3].[RepresentationID], [t3].[SegmentID]
FROM [dbo].[Representations] AS [t2], [dbo].[Estimates] AS [t3]
) AS [t6]
WHERE ([t6].[ID] = [t1].[RepresentationID]) AND ([t6].[RepresentationID] = [t6].[ID])
GROUP BY [t6].[SegmentID]
) AS [t7]
) AS [Estimate], (
SELECT COUNT(*)
FROM [dbo].[Leaves] AS [t8]
WHERE [t8].[BranchID] = [t0].[ID]
) AS [value]
FROM [dbo].[Branches] AS [t0]
LEFT OUTER JOIN [dbo].[Leaves] AS [t1] ON [t1].[BranchID] = [t0].[ID]
WHERE [t0].[LockedBy] = @p0
ORDER BY [t0].[ID], [t1].[ID] <-- Here's the unnecessary ORDER BY
最佳答案
需要 order by
才能区分子集合 Leaves
。 (每次你有一个子集合时,都有一个order by
)
关于c# - linq2sql 呈现不必要的 ORDER BY,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/6395081/