linq2sql使不必要的ORDER BY
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我有一个复杂的linq2sql查询，它不包含任何\'order by \'语句，但是linq2sql以某种方式认为这是必需的并插入它。不幸的是，这个“ order by”语句损害了性能，我不知道如何删除它。
这是linq2sql表达式（我认为它们可能没有帮助，但是无论如何...）
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
)
)
)
}
)
}
);
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
没有找到相关结果
已邀请:
1 个回复
青董据零
才能区分子集合。 （每次您有一个孩子收藏时，都会有）