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我没想到会生成这样的查询...
让我们回去,如果我保留一个包含,查询看起来不错,它做了一个简单的左连接
查询:
using (var db = new Context())
{
var data = db.MainTables.Include(x => x.LookupTables)
.Where(d => d.MainId == 10)
.FirstOrDefault();
}
生成的 SQL:
Opened connection at 2014-05-12 17:37:10 -04:00
SELECT
[Project1].[MainId] AS [MainId],
[Project1].[C1] AS [C1],
[Project1].[LookupId] AS [LookupId]
FROM ( SELECT
[Limit1].[MainId] AS [MainId],
[Extent2].[LookupId] AS [LookupId],
CASE WHEN ([Extent2].[MainId] IS NULL) THEN CAST(NULL AS int) ELSE 1 END AS [C1]
FROM (SELECT TOP (1) [Extent1].[MainId] AS [MainId]
FROM [dbo].[MainTable] AS [Extent1]
WHERE 10 = [Extent1].[MainId] ) AS [Limit1]
LEFT OUTER JOIN [dbo].[MainTable_LookupTable] AS [Extent2] ON [Limit1].[MainId] = [Extent2].[MainId]
) AS [Project1]
ORDER BY [Project1].[MainId] ASC, [Project1].[C1] ASC
-- Executing at 2014-05-12 17:37:11 -04:00
-- Completed in 11 ms with result: SqlDataReader
Closed connection at 2014-05-12 17:37:11 -04:00
如果我有多个,查询会变得像 UNION ALL 一样疯狂......
这是预期的行为吗?如果是,是否可以保留一个包含的行为,同时对所有包含使用多个简单的左连接?
型号:
查询:
using (var db = new Context())
{
var data = db.MainTables.Include(x => x.LookupTables)
.Include(x => x.MainTable_MoreData)
.Include(x => x.MaintTable_DataLookup)
.Include(x => x.MainTable_EvenMoreData)
.Where(d => d.MainId == 10)
.FirstOrDefault()
}
生成的 SQL:
Opened connection at 2014-05-12 18:00:56 -04:00
SELECT
[UnionAll3].[C2] AS [C1],
[UnionAll3].[C3] AS [C2],
[UnionAll3].[C4] AS [C3],
[UnionAll3].[C5] AS [C4],
[UnionAll3].[C6] AS [C5],
[UnionAll3].[C7] AS [C6],
[UnionAll3].[C8] AS [C7],
[UnionAll3].[C9] AS [C8],
[UnionAll3].[C10] AS [C9],
[UnionAll3].[C11] AS [C10],
[UnionAll3].[C12] AS [C11],
[UnionAll3].[C13] AS [C12],
[UnionAll3].[C1] AS [C13],
[UnionAll3].[C14] AS [C14],
[UnionAll3].[C15] AS [C15],
[UnionAll3].[C16] AS [C16],
[UnionAll3].[C17] AS [C17],
[UnionAll3].[C18] AS [C18],
[UnionAll3].[C19] AS [C19],
[UnionAll3].[C20] AS [C20],
[UnionAll3].[C21] AS [C21],
[UnionAll3].[C22] AS [C22],
[UnionAll3].[C23] AS [C23],
[UnionAll3].[C24] AS [C24],
[UnionAll3].[C25] AS [C25],
[UnionAll3].[C26] AS [C26],
[UnionAll3].[C27] AS [C27],
[UnionAll3].[C28] AS [C28],
[UnionAll3].[C29] AS [C29],
[UnionAll3].[C30] AS [C30],
[UnionAll3].[C31] AS [C31],
[UnionAll3].[C32] AS [C32],
[UnionAll3].[C33] AS [C33],
[UnionAll3].[C34] AS [C34],
[UnionAll3].[C35] AS [C35],
[UnionAll3].[C36] AS [C36],
[UnionAll3].[C37] AS [C37],
[UnionAll3].[C38] AS [C38],
[UnionAll3].[C39] AS [C39],
[UnionAll3].[C40] AS [C40],
[UnionAll3].[C41] AS [C41],
[UnionAll3].[C42] AS [C42],
[UnionAll3].[C43] AS [C43],
[UnionAll3].[C44] AS [C44],
[UnionAll3].[C45] AS [C45],
[UnionAll3].[C46] AS [C46],
[UnionAll3].[C47] AS [C47],
[UnionAll3].[C48] AS [C48],
[UnionAll3].[C49] AS [C49],
[UnionAll3].[C50] AS [C50],
[UnionAll3].[C51] AS [C51]
FROM (SELECT
[UnionAll2].[C1] AS [C1],
[UnionAll2].[C2] AS [C2],
[UnionAll2].[C3] AS [C3],
[UnionAll2].[C4] AS [C4],
[UnionAll2].[C5] AS [C5],
[UnionAll2].[C6] AS [C6],
[UnionAll2].[C7] AS [C7],
[UnionAll2].[C8] AS [C8],
[UnionAll2].[C9] AS [C9],
[UnionAll2].[C10] AS [C10],
[UnionAll2].[C11] AS [C11],
[UnionAll2].[C12] AS [C12],
[UnionAll2].[C13] AS [C13],
[UnionAll2].[C14] AS [C14],
[UnionAll2].[C15] AS [C15],
[UnionAll2].[C16] AS [C16],
[UnionAll2].[C17] AS [C17],
[UnionAll2].[C18] AS [C18],
[UnionAll2].[C19] AS [C19],
[UnionAll2].[C20] AS [C20],
[UnionAll2].[C21] AS [C21],
[UnionAll2].[C22] AS [C22],
[UnionAll2].[C23] AS [C23],
[UnionAll2].[C24] AS [C24],
[UnionAll2].[C25] AS [C25],
[UnionAll2].[C26] AS [C26],
[UnionAll2].[C27] AS [C27],
[UnionAll2].[C28] AS [C28],
[UnionAll2].[C29] AS [C29],
[UnionAll2].[C30] AS [C30],
[UnionAll2].[C31] AS [C31],
[UnionAll2].[C32] AS [C32],
[UnionAll2].[C33] AS [C33],
[UnionAll2].[C34] AS [C34],
[UnionAll2].[C35] AS [C35],
[UnionAll2].[C36] AS [C36],
[UnionAll2].[C37] AS [C37],
[UnionAll2].[C38] AS [C38],
[UnionAll2].[C39] AS [C39],
[UnionAll2].[C40] AS [C40],
[UnionAll2].[C41] AS [C41],
[UnionAll2].[C42] AS [C42],
[UnionAll2].[C43] AS [C43],
[UnionAll2].[C44] AS [C44],
[UnionAll2].[C45] AS [C45],
[UnionAll2].[C46] AS [C46],
[UnionAll2].[C47] AS [C47],
[UnionAll2].[C48] AS [C48],
[UnionAll2].[C49] AS [C49],
[UnionAll2].[C50] AS [C50],
[UnionAll2].[C51] AS [C51]
FROM (SELECT
[UnionAll1].[C1] AS [C1],
[UnionAll1].[MainId] AS [C2],
[UnionAll1].[MainId1] AS [C3],
[UnionAll1].[Field1] AS [C4],
[UnionAll1].[Field11] AS [C5],
[UnionAll1].[Field12] AS [C6],
[UnionAll1].[Field13] AS [C7],
[UnionAll1].[Field14] AS [C8],
[UnionAll1].[Field15] AS [C9],
[UnionAll1].[Field16] AS [C10],
[UnionAll1].[Field17] AS [C11],
[UnionAll1].[Field18] AS [C12],
[UnionAll1].[Field19] AS [C13],
[UnionAll1].[LookupId] AS [C14],
[UnionAll1].[Field161] AS [C15],
[UnionAll1].[Field151] AS [C16],
[UnionAll1].[Field141] AS [C17],
[UnionAll1].[Field131] AS [C18],
[UnionAll1].[Field121] AS [C19],
[UnionAll1].[Field111] AS [C20],
[UnionAll1].[Field110] AS [C21],
[UnionAll1].[C2] AS [C22],
[UnionAll1].[C3] AS [C23],
[UnionAll1].[C4] AS [C24],
[UnionAll1].[C5] AS [C25],
[UnionAll1].[C6] AS [C26],
[UnionAll1].[C7] AS [C27],
[UnionAll1].[C8] AS [C28],
[UnionAll1].[C9] AS [C29],
[UnionAll1].[C10] AS [C30],
[UnionAll1].[C11] AS [C31],
[UnionAll1].[C12] AS [C32],
[UnionAll1].[C13] AS [C33],
[UnionAll1].[C14] AS [C34],
[UnionAll1].[C15] AS [C35],
[UnionAll1].[C16] AS [C36],
[UnionAll1].[C17] AS [C37],
[UnionAll1].[C18] AS [C38],
[UnionAll1].[C19] AS [C39],
[UnionAll1].[C20] AS [C40],
[UnionAll1].[C21] AS [C41],
[UnionAll1].[C22] AS [C42],
[UnionAll1].[C23] AS [C43],
[UnionAll1].[C24] AS [C44],
[UnionAll1].[C25] AS [C45],
[UnionAll1].[C26] AS [C46],
[UnionAll1].[C27] AS [C47],
[UnionAll1].[C28] AS [C48],
[UnionAll1].[C29] AS [C49],
[UnionAll1].[C30] AS [C50],
[UnionAll1].[C31] AS [C51]
FROM (SELECT
CASE WHEN ([Join1].[MainId] IS NULL) THEN CAST(NULL AS int) ELSE 1 END AS [C1],
[Limit1].[MainId] AS [MainId],
[Limit1].[MainId] AS [MainId1],
[Limit1].[Field1] AS [Field1],
[Limit1].[Field11] AS [Field11],
[Limit1].[Field12] AS [Field12],
[Limit1].[Field13] AS [Field13],
[Limit1].[Field14] AS [Field14],
[Limit1].[Field15] AS [Field15],
[Limit1].[Field16] AS [Field16],
[Limit1].[Field17] AS [Field17],
[Limit1].[Field18] AS [Field18],
[Limit1].[Field19] AS [Field19],
[Join1].[LookupId1] AS [LookupId],
[Join1].[Field16] AS [Field161],
[Join1].[Field15] AS [Field151],
[Join1].[Field14] AS [Field141],
[Join1].[Field13] AS [Field131],
[Join1].[Field12] AS [Field121],
[Join1].[Field11] AS [Field111],
[Join1].[Field1] AS [Field110],
CAST(NULL AS int) AS [C2],
CAST(NULL AS int) AS [C3],
CAST(NULL AS varchar(1)) AS [C4],
CAST(NULL AS varchar(1)) AS [C5],
CAST(NULL AS varchar(1)) AS [C6],
CAST(NULL AS varchar(1)) AS [C7],
CAST(NULL AS varchar(1)) AS [C8],
CAST(NULL AS varchar(1)) AS [C9],
CAST(NULL AS varchar(1)) AS [C10],
CAST(NULL AS int) AS [C11],
CAST(NULL AS varchar(1)) AS [C12],
CAST(NULL AS varchar(1)) AS [C13],
CAST(NULL AS varchar(1)) AS [C14],
CAST(NULL AS varchar(1)) AS [C15],
CAST(NULL AS varchar(1)) AS [C16],
CAST(NULL AS varchar(1)) AS [C17],
CAST(NULL AS varchar(1)) AS [C18],
CAST(NULL AS int) AS [C19],
CAST(NULL AS int) AS [C20],
CAST(NULL AS int) AS [C21],
CAST(NULL AS varchar(1)) AS [C22],
CAST(NULL AS varchar(1)) AS [C23],
CAST(NULL AS varchar(1)) AS [C24],
CAST(NULL AS varchar(1)) AS [C25],
CAST(NULL AS varchar(1)) AS [C26],
CAST(NULL AS varchar(1)) AS [C27],
CAST(NULL AS varchar(1)) AS [C28],
CAST(NULL AS varchar(1)) AS [C29],
CAST(NULL AS varchar(1)) AS [C30],
CAST(NULL AS int) AS [C31]
FROM (SELECT TOP (1) [Extent1].[MainId] AS [MainId], [Extent1].[Field1] AS [Field1], [Extent1].[Field11] AS [Field11], [Extent1].[Field12] AS [Field12], [Extent1].[Field13] AS [Field13], [Extent1].[Field14] AS [Field14], [Extent1].[Field15] AS [Field15], [Extent1].[Field16] AS [Field16], [Extent1].[Field17] AS [Field17], [Extent1].[Field18] AS [Field18], [Extent1].[Field19] AS [Field19]
FROM [dbo].[MainTable] AS [Extent1]
WHERE 10 = [Extent1].[MainId] ) AS [Limit1]
LEFT OUTER JOIN (SELECT [Extent2].[MainId] AS [MainId], [Extent3].[LookupId] AS [LookupId1], [Extent3].[Field16] AS [Field16], [Extent3].[Field15] AS [Field15], [Extent3].[Field14] AS [Field14], [Extent3].[Field13] AS [Field13], [Extent3].[Field12] AS [Field12], [Extent3].[Field11] AS [Field11], [Extent3].[Field1] AS [Field1]
FROM [dbo].[MainTable_LookupTable] AS [Extent2]
INNER JOIN [dbo].[LookupTable] AS [Extent3] ON [Extent3].[LookupId] = [Extent2].[LookupId] ) AS [Join1] ON [Limit1].[MainId] = [Join1].[MainId]
UNION ALL
SELECT
2 AS [C1],
[Limit2].[MainId] AS [MainId],
[Limit2].[MainId] AS [MainId1],
[Limit2].[Field1] AS [Field1],
[Limit2].[Field11] AS [Field11],
[Limit2].[Field12] AS [Field12],
[Limit2].[Field13] AS [Field13],
[Limit2].[Field14] AS [Field14],
[Limit2].[Field15] AS [Field15],
[Limit2].[Field16] AS [Field16],
[Limit2].[Field17] AS [Field17],
[Limit2].[Field18] AS [Field18],
[Limit2].[Field19] AS [Field19],
CAST(NULL AS int) AS [C2],
CAST(NULL AS varchar(1)) AS [C3],
CAST(NULL AS varchar(1)) AS [C4],
CAST(NULL AS varchar(1)) AS [C5],
CAST(NULL AS varchar(1)) AS [C6],
CAST(NULL AS varchar(1)) AS [C7],
CAST(NULL AS varchar(1)) AS [C8],
CAST(NULL AS varchar(1)) AS [C9],
[Extent5].[DataId] AS [DataId],
[Extent5].[MainId] AS [MainId2],
[Extent5].[SomeData] AS [SomeData],
[Extent5].[Field1] AS [Field110],
[Extent5].[Field11] AS [Field111],
[Extent5].[Field12] AS [Field121],
[Extent5].[Field13] AS [Field131],
[Extent5].[Field14] AS [Field141],
[Extent5].[Field15] AS [Field151],
CAST(NULL AS int) AS [C10],
CAST(NULL AS varchar(1)) AS [C11],
CAST(NULL AS varchar(1)) AS [C12],
CAST(NULL AS varchar(1)) AS [C13],
CAST(NULL AS varchar(1)) AS [C14],
CAST(NULL AS varchar(1)) AS [C15],
CAST(NULL AS varchar(1)) AS [C16],
CAST(NULL AS varchar(1)) AS [C17],
CAST(NULL AS int) AS [C18],
CAST(NULL AS int) AS [C19],
CAST(NULL AS int) AS [C20],
CAST(NULL AS varchar(1)) AS [C21],
CAST(NULL AS varchar(1)) AS [C22],
CAST(NULL AS varchar(1)) AS [C23],
CAST(NULL AS varchar(1)) AS [C24],
CAST(NULL AS varchar(1)) AS [C25],
CAST(NULL AS varchar(1)) AS [C26],
CAST(NULL AS varchar(1)) AS [C27],
CAST(NULL AS varchar(1)) AS [C28],
CAST(NULL AS varchar(1)) AS [C29],
CAST(NULL AS int) AS [C30]
FROM (SELECT TOP (1) [Extent4].[MainId] AS [MainId], [Extent4].[Field1] AS [Field1], [Extent4].[Field11] AS [Field11], [Extent4].[Field12] AS [Field12], [Extent4].[Field13] AS [Field13], [Extent4].[Field14] AS [Field14], [Extent4].[Field15] AS [Field15], [Extent4].[Field16] AS [Field16], [Extent4].[Field17] AS [Field17], [Extent4].[Field18] AS [Field18], [Extent4].[Field19] AS [Field19]
FROM [dbo].[MainTable] AS [Extent4]
WHERE 10 = [Extent4].[MainId] ) AS [Limit2]
INNER JOIN [dbo].[MainTable_MoreData] AS [Extent5] ON [Limit2].[MainId] = [Extent5].[MainId]) AS [UnionAll1]
UNION ALL
SELECT
3 AS [C1],
[Limit3].[MainId] AS [MainId],
[Limit3].[MainId] AS [MainId1],
[Limit3].[Field1] AS [Field1],
[Limit3].[Field11] AS [Field11],
[Limit3].[Field12] AS [Field12],
[Limit3].[Field13] AS [Field13],
[Limit3].[Field14] AS [Field14],
[Limit3].[Field15] AS [Field15],
[Limit3].[Field16] AS [Field16],
[Limit3].[Field17] AS [Field17],
[Limit3].[Field18] AS [Field18],
[Limit3].[Field19] AS [Field19],
CAST(NULL AS int) AS [C2],
CAST(NULL AS varchar(1)) AS [C3],
CAST(NULL AS varchar(1)) AS [C4],
CAST(NULL AS varchar(1)) AS [C5],
CAST(NULL AS varchar(1)) AS [C6],
CAST(NULL AS varchar(1)) AS [C7],
CAST(NULL AS varchar(1)) AS [C8],
CAST(NULL AS varchar(1)) AS [C9],
CAST(NULL AS int) AS [C10],
CAST(NULL AS int) AS [C11],
CAST(NULL AS varchar(1)) AS [C12],
CAST(NULL AS varchar(1)) AS [C13],
CAST(NULL AS varchar(1)) AS [C14],
CAST(NULL AS varchar(1)) AS [C15],
CAST(NULL AS varchar(1)) AS [C16],
CAST(NULL AS varchar(1)) AS [C17],
CAST(NULL AS varchar(1)) AS [C18],
[Extent7].[MainId] AS [MainId2],
[Extent7].[Data] AS [Data],
[Extent7].[Field1] AS [Field110],
[Extent7].[Field11] AS [Field111],
[Extent7].[Field12] AS [Field121],
[Extent7].[Field14] AS [Field141],
[Extent7].[Field15] AS [Field151],
[Extent7].[Field13] AS [Field131],
[Extent7].[MainId] AS [MainId3],
CAST(NULL AS int) AS [C19],
CAST(NULL AS int) AS [C20],
CAST(NULL AS varchar(1)) AS [C21],
CAST(NULL AS varchar(1)) AS [C22],
CAST(NULL AS varchar(1)) AS [C23],
CAST(NULL AS varchar(1)) AS [C24],
CAST(NULL AS varchar(1)) AS [C25],
CAST(NULL AS varchar(1)) AS [C26],
CAST(NULL AS varchar(1)) AS [C27],
CAST(NULL AS varchar(1)) AS [C28],
CAST(NULL AS varchar(1)) AS [C29],
CAST(NULL AS int) AS [C30]
FROM (SELECT TOP (1) [Extent6].[MainId] AS [MainId], [Extent6].[Field1] AS [Field1], [Extent6].[Field11] AS [Field11], [Extent6].[Field12] AS [Field12], [Extent6].[Field13] AS [Field13], [Extent6].[Field14] AS [Field14], [Extent6].[Field15] AS [Field15], [Extent6].[Field16] AS [Field16], [Extent6].[Field17] AS [Field17], [Extent6].[Field18] AS [Field18], [Extent6].[Field19] AS [Field19]
FROM [dbo].[MainTable] AS [Extent6]
WHERE 10 = [Extent6].[MainId] ) AS [Limit3]
INNER JOIN [dbo].[MaintTable_DataLookup] AS [Extent7] ON [Limit3].[MainId] = [Extent7].[MainId]) AS [UnionAll2]
UNION ALL
SELECT
4 AS [C1],
[Limit4].[MainId] AS [MainId],
[Limit4].[MainId] AS [MainId1],
[Limit4].[Field1] AS [Field1],
[Limit4].[Field11] AS [Field11],
[Limit4].[Field12] AS [Field12],
[Limit4].[Field13] AS [Field13],
[Limit4].[Field14] AS [Field14],
[Limit4].[Field15] AS [Field15],
[Limit4].[Field16] AS [Field16],
[Limit4].[Field17] AS [Field17],
[Limit4].[Field18] AS [Field18],
[Limit4].[Field19] AS [Field19],
CAST(NULL AS int) AS [C2],
CAST(NULL AS varchar(1)) AS [C3],
CAST(NULL AS varchar(1)) AS [C4],
CAST(NULL AS varchar(1)) AS [C5],
CAST(NULL AS varchar(1)) AS [C6],
CAST(NULL AS varchar(1)) AS [C7],
CAST(NULL AS varchar(1)) AS [C8],
CAST(NULL AS varchar(1)) AS [C9],
CAST(NULL AS int) AS [C10],
CAST(NULL AS int) AS [C11],
CAST(NULL AS varchar(1)) AS [C12],
CAST(NULL AS varchar(1)) AS [C13],
CAST(NULL AS varchar(1)) AS [C14],
CAST(NULL AS varchar(1)) AS [C15],
CAST(NULL AS varchar(1)) AS [C16],
CAST(NULL AS varchar(1)) AS [C17],
CAST(NULL AS varchar(1)) AS [C18],
CAST(NULL AS int) AS [C19],
CAST(NULL AS varchar(1)) AS [C20],
CAST(NULL AS varchar(1)) AS [C21],
CAST(NULL AS varchar(1)) AS [C22],
CAST(NULL AS varchar(1)) AS [C23],
CAST(NULL AS varchar(1)) AS [C24],
CAST(NULL AS varchar(1)) AS [C25],
CAST(NULL AS varchar(1)) AS [C26],
CAST(NULL AS int) AS [C27],
[Extent9].[LookupId] AS [LookupId],
[Extent9].[MainId] AS [MainId2],
[Extent9].[MoreMoreData] AS [MoreMoreData],
[Extent9].[Field17] AS [Field171],
[Extent9].[Field16] AS [Field161],
[Extent9].[Field15] AS [Field151],
[Extent9].[Field14] AS [Field141],
[Extent9].[Field13] AS [Field131],
[Extent9].[Field12] AS [Field121],
[Extent9].[Field11] AS [Field111],
[Extent9].[Field1] AS [Field110],
[Extent9].[MainId] AS [MainId3]
FROM (SELECT TOP (1) [Extent8].[MainId] AS [MainId], [Extent8].[Field1] AS [Field1], [Extent8].[Field11] AS [Field11], [Extent8].[Field12] AS [Field12], [Extent8].[Field13] AS [Field13], [Extent8].[Field14] AS [Field14], [Extent8].[Field15] AS [Field15], [Extent8].[Field16] AS [Field16], [Extent8].[Field17] AS [Field17], [Extent8].[Field18] AS [Field18], [Extent8].[Field19] AS [Field19]
FROM [dbo].[MainTable] AS [Extent8]
WHERE 10 = [Extent8].[MainId] ) AS [Limit4]
INNER JOIN [dbo].[MainTable_EvenMoreData] AS [Extent9] ON [Limit4].[MainId] = [Extent9].[MainId]) AS [UnionAll3]
ORDER BY [UnionAll3].[C3] ASC, [UnionAll3].[C1] ASC
-- Executing at 2014-05-12 18:00:57 -04:00
-- Completed in 39 ms with result: SqlDataReader
sql 服务器结果
2 行就够了,为什么要 8 行?
此数据库示例未使用索引等进行优化,但这是执行计划
理想情况下,我想生成一个看起来像这样的查询,同时保持 Entity Framework 跟踪更改,因为我将使用该对象来更新数据库
SELECT dbo.MainTable.MainId, dbo.MainTable.Field1, dbo.MainTable.Field11, dbo.MainTable.Field12, dbo.MainTable.Field13, dbo.MainTable.Field14,
dbo.MainTable.Field15, dbo.MainTable.Field16, dbo.MainTable.Field17, dbo.MainTable.Field18, dbo.MainTable.Field19, dbo.MainTable_EvenMoreData.LookupId,
dbo.MainTable_EvenMoreData.MainId AS Expr1, dbo.MainTable_EvenMoreData.MoreMoreData, dbo.MainTable_EvenMoreData.Field17 AS Expr2,
dbo.MainTable_EvenMoreData.Field16 AS Expr3, dbo.MainTable_EvenMoreData.Field15 AS Expr4, dbo.MainTable_EvenMoreData.Field14 AS Expr5,
dbo.MainTable_EvenMoreData.Field13 AS Expr6, dbo.MainTable_EvenMoreData.Field12 AS Expr7, dbo.MainTable_EvenMoreData.Field11 AS Expr8,
dbo.MainTable_EvenMoreData.Field1 AS Expr9, dbo.MainTable_LookupTable.MainId AS Expr10, dbo.MainTable_LookupTable.LookupId AS Expr11,
dbo.MainTable_MoreData.DataId, dbo.MainTable_MoreData.MainId AS Expr12, dbo.MainTable_MoreData.SomeData, dbo.MainTable_MoreData.Field1 AS Expr13,
dbo.MainTable_MoreData.Field11 AS Expr14, dbo.MainTable_MoreData.Field12 AS Expr15, dbo.MainTable_MoreData.Field13 AS Expr16,
dbo.MainTable_MoreData.Field14 AS Expr17, dbo.MainTable_MoreData.Field15 AS Expr18, dbo.MaintTable_DataLookup.MainId AS Expr19,
dbo.MaintTable_DataLookup.Data, dbo.MaintTable_DataLookup.Field1 AS Expr20, dbo.MaintTable_DataLookup.Field11 AS Expr21,
dbo.MaintTable_DataLookup.Field12 AS Expr22, dbo.MaintTable_DataLookup.Field14 AS Expr23, dbo.MaintTable_DataLookup.Field15 AS Expr24,
dbo.MaintTable_DataLookup.Field13 AS Expr25
FROM dbo.MainTable LEFT OUTER JOIN
dbo.MainTable_EvenMoreData ON dbo.MainTable.MainId = dbo.MainTable_EvenMoreData.MainId LEFT OUTER JOIN
dbo.MainTable_LookupTable ON dbo.MainTable.MainId = dbo.MainTable_LookupTable.MainId LEFT OUTER JOIN
dbo.MainTable_MoreData ON dbo.MainTable.MainId = dbo.MainTable_MoreData.MainId LEFT OUTER JOIN
dbo.MaintTable_DataLookup ON dbo.MainTable.MainId = dbo.MaintTable_DataLookup.MainId
WHERE dbo.MainTable.MainId = 10
最佳答案
所以在玩了几个小时之后,我在 sql server 上做了一些负载平衡/执行计划/统计,有一个简单的左连接和 Entity Framework 做的巨大查询。
Entity Framework 似乎大胜。
我将实现 .include() 解决方案。
关于c# - 在 Entity Framework 中使用 .include 创建巨大的查询?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/23619402/
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