SQL查询比较处理效率，有更好的解决方案吗？

Question

我正在处理大约 1.34 亿行的大型数据集，我想在 table 中插入一个 select 查询。这是我的 table SQL script (SQL Fiddle).

------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Id | Emitter    |   EmitterIBAN                         |  Receiver    |   ReceiverIBAN                           |         Adresss                          |     Value 
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
1,   Ernst,         HR53 8827 2118 4692 8207 5,           Kimbra,         CH20 1042 6T0N MDTG JT47 U,                     3256 Arrowood Point         0002,        121.72
2,   Keene,         SK81 1004 7484 7505 6308 9259,        Torrance,       RO23 ZWTR OJKK VAU9 T5P4 2GDY,                  35197 Green Ridge Way,                   82.52
3,   Ernst,         HR53 8827 2118 4692 8207 5,           Kimbra,         CH20 1042 6T0N MDTG JT47 U,                     3256 Arrowood Point         0048,        51.81
4,   Korie,         ME43 9833 9830 7367 4239 60,Roy,      IL69            9686 1536 8102 2219 165,                        5 Swallow Alley,                         88.01
5,   Ernst,         HR53 8827 2118 4692 8207 5,           Kimbra,         CH20 1042 6T0N MDTG JT47 U,                     3256 Arrowood Point         0001,        133.99
6,   Charmine,      BG92 TOXX 8380 785I JKRQ JS,          Sarette,        MU67 RYRU 9293 5875 6859 7111 075X HR,          8 Sage Place,                            36.30
7,   Ernst,         HR53 8827 2118 4692 8207 5,           Kimbra,         CH20 1042 6T0N MDTG JT47 U,                     3256 Arrowood Point         0004,        186.99

我 select 我的数据与此查询


Select  count(1) as NumberOperation, 
        MAX(Emitter) as EmitterName, 
        EmitterIban, 
        MAX(Receiver) as ReceiverName, 
        ReceiverIban,
        MAX(ReceiverAddress) as ReceiverAddress,
        SUM([Value]) as SumValues
FROM TableEsperadoceTransaction
Group By EmitterIban,
         ReceiverIban

我得到以下结果

-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
NumberOperation | Emitter    |   EmitterIBAN                         |  Receiver    |   ReceiverIBAN                           |         Adresss                          |     SumValue 
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
4,                Ernst,         HR53 8827 2118 4692 8207 5,           Kimbra,         CH20 1042 6T0N MDTG JT47 U,                     3256 Arrowood Point           0002,      494,51
1,                Keene,         SK81 1004 7484 7505 6308 9259,        Torrance,       RO23 ZWTR OJKK VAU9 T5P4 2GDY,                  35197 Green Ridge Way,                   82.52
1,                Korie,         ME43 9833 9830 7367 4239 60,Roy,      IL69            9686 1536 8102 2219 165,                        5 Swallow Alley,                         88.01
1,                Charmine,      BG92 TOXX 8380 785I JKRQ JS,          Sarette,        MU67 RYRU 9293 5875 6859 7111 075X HR,          8 Sage Place,                            36.30

我也有这个解决方案


SELECT DISTINCT *
FROM   (SELECT Count(1)     AS NumberOperation, 
               emitteriban  AS _EmitterIban, 
               receiveriban AS _ReceiverIban, 
               Sum([value]) AS SumValues 
        FROM   tableesperadocetransaction 
        GROUP  BY emitteriban, 
                  receiveriban) tmp_T 
       LEFT JOIN tableesperadocetransaction 
              ON tableesperadocetransaction.emitteriban = tmp_T._emitteriban 
                 AND tableesperadocetransaction.receiveriban = 
                     tmp_T._receiveriban

我想知道这两者之间最好的解决方案是什么，是否有比这更有效的查询？

谢谢

Answer 1

第二个查询较慢，因为：

它有一个LEFT JOIN
它有一个子查询
它有一个SELECT DISTINCT
有一个 * 而不是列名

第一种是最自然的方法。

有很多关于如何提高查询性能以及应避免什么的内容。参见示例：MSDN on improving queries

Answer 2

第一个查询应该更有效率。

如果你真的想加快速度，你需要确保你有一个以 EmitterIban 和 ReceiverIban 为键的覆盖索引。

Answer 3

你可以试试这个。

在将其用于 INNER JOIN 后，您将获得 MIN(id)。这也是一种方式。

SELECT
tmp.NumberOperation
,tb.Emitter
,tmp.EmitterIban
,tb.Receiver
,tmp.ReceiverIban
,tb.Adresss
,tmp.SumValues
FROM   (SELECT Count(1)     AS NumberOperation, 
               emitteriban  AS EmitterIban, 
               receiveriban AS ReceiverIban, 
               Sum([value]) AS SumValues,
               MIN(Id)      AS Id
        FROM   tableesperadocetransaction 
        GROUP  BY emitteriban, 
                  receiveriban) tmp
       INNER JOIN tableesperadocetransaction tb
              ON tableesperadocetransaction.id = tmp.Id

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