SQLite - 帮助优化具有多个条件的先前行的聚合总数-6ren

SQLite - 帮助优化具有多个条件的先前行的聚合总数

转载作者：行者123 更新时间：2023-12-03 17:49:40

对于按相同“类别”字段值和相同“已批准”字段值分组的所有“先前”记录，我正在尝试获取表中每条记录的值列的条件总和，然后分为负和正数。

在我的程序中，用户可以按任意顺序创建文档记录，因此“上一个”定义为:

如果 Approved=TRUE，则“上一个”记录具有比当前记录更旧的 ApprovedDate 字段值。如果 ApprovedDate 字段值相同，则“上一个”记录具有较低的 DocumentNumber 字段值。

如果 Approved=FALSE，则“上一个”记录具有比当前记录更旧的 IssuedDate 字段值。如果 IssuedDate 字段值相同，则“上一个”记录具有较低的 DocumentNumber 字段值。

例如，在下表中:

CREATE TABLE Changes (GUID TEXT, Value REAL, DocumentNumber TEXT, Approved INTEGER, ApprovedDate TEXT, IssuedDate TEXT, Category TEXT);
INSERT INTO Changes (GUID, DocumentNumber, Approved, Value, ApprovedDate, IssuedDate, Category) VALUES ('4F7253A4E1B3D841B84D4A82B4F0E7A2', '11', 0, 18526.7, '', '2009-03-31T05:00:00Z', 'UNKNOWN');
INSERT INTO Changes (GUID, DocumentNumber, Approved, Value, ApprovedDate, IssuedDate, Category) VALUES ('D97537852E927B499C21C14F3D13CF06', '1', 0, 0, '', '2008-11-10T05:00:00Z', 'UNKNOWN');
INSERT INTO Changes (GUID, DocumentNumber, Approved, Value, ApprovedDate, IssuedDate, Category) VALUES ('857DADB463807345918729B33399B36F', '2', 0, 0, '', '2008-11-10T05:00:00Z', 'UNKNOWN');
INSERT INTO Changes (GUID, DocumentNumber, Approved, Value, ApprovedDate, IssuedDate, Category) VALUES ('7989D242E05AFF4FB5EE99114822BF80', '21', 0, 50112, '', '2009-07-22T05:00:00Z', 'UNKNOWN');
INSERT INTO Changes (GUID, DocumentNumber, Approved, Value, ApprovedDate, IssuedDate, Category) VALUES ('16A0AB27FD3A784D9E0A14406C7683E0', '3', 0, 0, '', '2009-01-15T05:00:00Z', 'UNKNOWN');
INSERT INTO Changes (GUID, DocumentNumber, Approved, Value, ApprovedDate, IssuedDate, Category) VALUES ('D3D7B1C306D38C438FC3DEDFCB57D411', '131', 0, 17204, '', '2010-12-14T05:00:00Z', 'UNKNOWN');
INSERT INTO Changes (GUID, DocumentNumber, Approved, Value, ApprovedDate, IssuedDate, Category) VALUES ('2C89D974DDF86743A0D7D62B385FBDEF', '147', 0, 0, '', '2010-12-01T05:00:00Z', 'UNKNOWN');
INSERT INTO Changes (GUID, DocumentNumber, Approved, Value, ApprovedDate, IssuedDate, Category) VALUES ('F371D4237C837D448824697EB0162905', '198', 0, 0, '', '2011-01-10T05:00:00Z', 'UNKNOWN');
INSERT INTO Changes (GUID, DocumentNumber, Approved, Value, ApprovedDate, IssuedDate, Category) VALUES ('433D64C871AE4E46A0E1BFCE2BB69BA7', '364', 0, 0, '', '2011-11-14T05:00:00Z', 'UNKNOWN');
INSERT INTO Changes (GUID, DocumentNumber, Approved, Value, ApprovedDate, IssuedDate, Category) VALUES ('808496DBDE76CB4F911396BB817724F3', '352', 0, 0, '', '2011-10-17T05:00:00Z', 'UNKNOWN');
INSERT INTO Changes (GUID, DocumentNumber, Approved, Value, ApprovedDate, IssuedDate, Category) VALUES ('9545DEF1666B5F4D8626F19F8E9E9333', '418', 0, 10948, '', '2012-03-07T22:19:18Z', 'UNKNOWN');
INSERT INTO Changes (GUID, DocumentNumber, Approved, Value, ApprovedDate, IssuedDate, Category) VALUES ('244D7D89B79E0F4E91100E4ADB300656', '439', 0, 50945, '', '2012-04-27T20:33:26Z', 'UNKNOWN');
INSERT INTO Changes (GUID, DocumentNumber, Approved, Value, ApprovedDate, IssuedDate, Category) VALUES ('115A427BBB1D2C43BA11D9E5875FAA2C', '465', 0, 480049, '', '2012-07-20T16:17:54Z', 'UNKNOWN');
INSERT INTO Changes (GUID, DocumentNumber, Approved, Value, ApprovedDate, IssuedDate, Category) VALUES ('3A2271EFCC767E4CA40017E68802F10C', '478', 0, 54298, '', '2012-08-01T17:26:38Z', 'UNKNOWN');
INSERT INTO Changes (GUID, DocumentNumber, Approved, Value, ApprovedDate, IssuedDate, Category) VALUES ('99D0EFC5A9F1AA498DB1A4CDF294129B', '490', 0, 11500, '', '2012-09-18T14:23:13Z', 'ALTER');
INSERT INTO Changes (GUID, DocumentNumber, Approved, Value, ApprovedDate, IssuedDate, Category) VALUES ('38B2E3A379C5084998E6A84D496AC555', '491', 0, 26088, '', '2012-09-25T06:00:00Z', 'ALTER');
INSERT INTO Changes (GUID, DocumentNumber, Approved, Value, ApprovedDate, IssuedDate, Category) VALUES ('8902831C8FAD4941841EE2847656BDAF', '494', 0, -825, '', '2012-10-16T14:20:06Z', 'ALTER');
INSERT INTO Changes (GUID, DocumentNumber, Approved, Value, ApprovedDate, IssuedDate, Category) VALUES ('7AFDB08A002AE54A8DE7699855AEBE30', '495', 0, 221, '', '2012-10-16T14:21:27Z', 'ALTER');
INSERT INTO Changes (GUID, DocumentNumber, Approved, Value, ApprovedDate, IssuedDate, Category) VALUES ('38A2CCEF5F0B294AA8B8752F461D121D', '496', 0, 0, '', '2012-12-24T01:11:15Z', 'ALTER');
INSERT INTO Changes (GUID, DocumentNumber, Approved, Value, ApprovedDate, IssuedDate, Category) VALUES ('24CCD5CE409E674593108CBD816DBCCE', '486', 1, -825, '2012-10-01T21:42:52Z', '2012-09-17T20:42:12Z', 'ALTER');
INSERT INTO Changes (GUID, DocumentNumber, Approved, Value, ApprovedDate, IssuedDate, Category) VALUES ('C7458704E36C8F448C1F3A485EB08304', '485', 1, 10000, '2012-10-01T21:25:56Z', '2012-09-11T21:29:44Z', 'ALTER');
INSERT INTO Changes (GUID, DocumentNumber, Approved, Value, ApprovedDate, IssuedDate, Category) VALUES ('B511953AE6FB6446A63AA83C159057BE', '487', 1, 82170, '2012-10-01T21:42:51Z', '2012-09-17T20:46:41Z', 'ALTER');
INSERT INTO Changes (GUID, DocumentNumber, Approved, Value, ApprovedDate, IssuedDate, Category) VALUES ('EC977BC304A971439D04BB9DF4D8188A', '488', 1, 15500, '2012-10-01T20:58:15Z', '2012-09-18T06:00:00Z', 'ALTER');
INSERT INTO Changes (GUID, DocumentNumber, Approved, Value, ApprovedDate, IssuedDate, Category) VALUES ('D9B1F0C0A8E490448697B783639E09E0', '489', 1, 11503, '2012-10-01T21:42:50Z', '2012-09-18T13:56:18Z', 'ALTER');
INSERT INTO Changes (GUID, DocumentNumber, Approved, Value, ApprovedDate, IssuedDate, Category) VALUES ('698BB6D65832D146A49727C717A591A1', '492', 1, 2787, '2012-10-01T21:10:06Z', '2012-09-25T15:55:02Z', 'ALTER');
INSERT INTO Changes (GUID, DocumentNumber, Approved, Value, ApprovedDate, IssuedDate, Category) VALUES ('155D4F2B1854B34FABCDE8CF20F1E44C', '493', 1, 12162, '2012-10-01T21:10:06Z', '2012-09-25T16:04:40Z', 'ALTER');
INSERT INTO Changes (GUID, DocumentNumber, Approved, Value, ApprovedDate, IssuedDate, Category) VALUES ('137C9BF2B1EFD34B8831ADA70C5F9431', '1', 1, 369543, '2011-12-08T13:41:04Z', '1899-12-30T05:00:00Z', 'DRAW');
INSERT INTO Changes (GUID, DocumentNumber, Approved, Value, ApprovedDate, IssuedDate, Category) VALUES ('7F29FC7114BD10468AE92A047345B5DB', '2', 1, 7258, '2011-12-08T13:41:04Z', '2011-10-20T05:00:00Z', 'DRAW');
INSERT INTO Changes (GUID, DocumentNumber, Approved, Value, ApprovedDate, IssuedDate, Category) VALUES ('6B66D8EAD88E6E4FA29401CD524B978A', '3', 1, 979321, '2011-12-08T13:41:04Z', '2011-11-08T05:00:00Z', 'DRAW');
INSERT INTO Changes (GUID, DocumentNumber, Approved, Value, ApprovedDate, IssuedDate, Category) VALUES ('7F393B712B213041A6DD211E04F6DCA6', '4', 1, 14998, '2012-04-20T15:16:21Z', '2012-04-18T21:07:07Z', 'DRAW');
INSERT INTO Changes (GUID, DocumentNumber, Approved, Value, ApprovedDate, IssuedDate, Category) VALUES ('2255F84E7C7DA04389765724872D6413', '5', 1, 58926, '2012-04-20T15:16:23Z', '2012-04-18T21:13:15Z', 'DRAW');
INSERT INTO Changes (GUID, DocumentNumber, Approved, Value, ApprovedDate, IssuedDate, Category) VALUES ('DB4A5588DEB9F34C868F7AD1CB13ACC3', '6', 1, 13232, '2012-04-20T15:16:05Z', '2012-04-18T21:17:00Z', 'DRAW');
INSERT INTO Changes (GUID, DocumentNumber, Approved, Value, ApprovedDate, IssuedDate, Category) VALUES ('B5231AE40F8E7D41BA0A4D09614CBDF9', '7', 1, 10176, '2012-04-20T15:16:25Z', '2012-04-18T21:19:41Z', 'DRAW');
INSERT INTO Changes (GUID, DocumentNumber, Approved, Value, ApprovedDate, IssuedDate, Category) VALUES ('2362D54FCC53E447AC7D8289EA89FD05', '8', 1, 17556, '2012-04-20T15:16:04Z', '2012-04-18T21:21:20Z', 'DRAW');
INSERT INTO Changes (GUID, DocumentNumber, Approved, Value, ApprovedDate, IssuedDate, Category) VALUES ('6ED4565CA041704B8D006EDA4A1E4CF9', '9', 1, 399639, '2012-05-30T16:32:43Z', '2012-05-17T06:00:00Z', 'DRAW');
INSERT INTO Changes (GUID, DocumentNumber, Approved, Value, ApprovedDate, IssuedDate, Category) VALUES ('B21BE07E3E42C2418C70AD17862D3AE1', '10', 1, 6231, '2012-08-16T16:55:00Z', '2012-08-02T16:02:03Z', 'DRAW');
INSERT INTO Changes (GUID, DocumentNumber, Approved, Value, ApprovedDate, IssuedDate, Category) VALUES ('8FD252A50137754A98698F93AC9B01A7', '11', 1, 629, '2012-08-16T16:54:58Z', '2012-08-02T16:07:57Z', 'DRAW');
INSERT INTO Changes (GUID, DocumentNumber, Approved, Value, ApprovedDate, IssuedDate, Category) VALUES ('1B9AFD2C20362F48A486E8A535B29AF5', '20', 1, -113810, '2011-12-13T17:15:53Z', '2010-02-10T05:00:00Z', 'UNKNOWN');

结果应该是:

[结果][2] :

|                             GUID |                             SORTID |          VALUE | POSITIVE_PREVIOUS_TOTAL | NEGATIVE_PREVIOUS_TOTAL |
----------------------------------------------------------------------------------------------------------------------------------------------
| 99D0EFC5A9F1AA498DB1A4CDF294129B |   ALTER_0_2012-09-18T14:23:13Z_490 |          11500 |                       0 |                       0 |
| 38B2E3A379C5084998E6A84D496AC555 |   ALTER_0_2012-09-25T06:00:00Z_491 |          26088 |                   11500 |                       0 |
| 8902831C8FAD4941841EE2847656BDAF |   ALTER_0_2012-10-16T14:20:06Z_494 |           -825 |                   37588 |                       0 |
| 7AFDB08A002AE54A8DE7699855AEBE30 |   ALTER_0_2012-10-16T14:21:27Z_495 |            221 |                   37588 |                    -825 |
| 38A2CCEF5F0B294AA8B8752F461D121D |   ALTER_0_2012-12-24T01:11:15Z_496 |              0 |                   37809 |                    -825 |
| EC977BC304A971439D04BB9DF4D8188A |   ALTER_1_2012-10-01T20:58:15Z_488 |          15500 |                   92170 |                    -825 |
| 698BB6D65832D146A49727C717A591A1 |   ALTER_1_2012-10-01T21:10:06Z_492 |           2787 |                  119173 |                    -825 |
| 155D4F2B1854B34FABCDE8CF20F1E44C |   ALTER_1_2012-10-01T21:10:06Z_493 |          12162 |                  121960 |                    -825 |
| C7458704E36C8F448C1F3A485EB08304 |   ALTER_1_2012-10-01T21:25:56Z_485 |          10000 |                       0 |                       0 |
| D9B1F0C0A8E490448697B783639E09E0 |   ALTER_1_2012-10-01T21:42:50Z_489 |          11503 |                  107670 |                    -825 |
| B511953AE6FB6446A63AA83C159057BE |   ALTER_1_2012-10-01T21:42:51Z_487 |          82170 |                   10000 |                    -825 |
| 24CCD5CE409E674593108CBD816DBCCE |   ALTER_1_2012-10-01T21:42:52Z_486 |           -825 |                   10000 |                       0 |
| 137C9BF2B1EFD34B8831ADA70C5F9431 |      DRAW_1_2011-12-08T13:41:04Z_1 |         369543 |                       0 |                       0 |
| 7F29FC7114BD10468AE92A047345B5DB |      DRAW_1_2011-12-08T13:41:04Z_2 |           7258 |                  369543 |                       0 |
| 6B66D8EAD88E6E4FA29401CD524B978A |      DRAW_1_2011-12-08T13:41:04Z_3 |         979321 |                  376801 |                       0 |
| 2362D54FCC53E447AC7D8289EA89FD05 |      DRAW_1_2012-04-20T15:16:04Z_8 |          17556 |                 1453454 |                       0 |
| DB4A5588DEB9F34C868F7AD1CB13ACC3 |      DRAW_1_2012-04-20T15:16:05Z_6 |          13232 |                 1430046 |                       0 |
| 7F393B712B213041A6DD211E04F6DCA6 |      DRAW_1_2012-04-20T15:16:21Z_4 |          14998 |                 1356122 |                       0 |
| 2255F84E7C7DA04389765724872D6413 |      DRAW_1_2012-04-20T15:16:23Z_5 |          58926 |                 1371120 |                       0 |
| B5231AE40F8E7D41BA0A4D09614CBDF9 |      DRAW_1_2012-04-20T15:16:25Z_7 |          10176 |                 1443278 |                       0 |
| 6ED4565CA041704B8D006EDA4A1E4CF9 |      DRAW_1_2012-05-30T16:32:43Z_9 |         399639 |                 1471010 |                       0 |
| 8FD252A50137754A98698F93AC9B01A7 |     DRAW_1_2012-08-16T16:54:58Z_11 |            629 |                 1876880 |                       0 |
| B21BE07E3E42C2418C70AD17862D3AE1 |     DRAW_1_2012-08-16T16:55:00Z_10 |           6231 |                 1870649 |                       0 |
| D97537852E927B499C21C14F3D13CF06 |   UNKNOWN_0_2008-11-10T05:00:00Z_1 |              0 |                       0 |                       0 |
| 857DADB463807345918729B33399B36F |   UNKNOWN_0_2008-11-10T05:00:00Z_2 |              0 |                       0 |                       0 |
| 16A0AB27FD3A784D9E0A14406C7683E0 |   UNKNOWN_0_2009-01-15T05:00:00Z_3 |              0 |                       0 |                       0 |
| 4F7253A4E1B3D841B84D4A82B4F0E7A2 |  UNKNOWN_0_2009-03-31T05:00:00Z_11 | 18526.69921875 |                       0 |                       0 |
| 7989D242E05AFF4FB5EE99114822BF80 |  UNKNOWN_0_2009-07-22T05:00:00Z_21 |          50112 |          18526.69921875 |                       0 |
| 2C89D974DDF86743A0D7D62B385FBDEF | UNKNOWN_0_2010-12-01T05:00:00Z_147 |              0 |          68638.69921875 |                       0 |
| D3D7B1C306D38C438FC3DEDFCB57D411 | UNKNOWN_0_2010-12-14T05:00:00Z_131 |          17204 |          68638.69921875 |                       0 |
| F371D4237C837D448824697EB0162905 | UNKNOWN_0_2011-01-10T05:00:00Z_198 |              0 |          85842.69921875 |                       0 |
| 808496DBDE76CB4F911396BB817724F3 | UNKNOWN_0_2011-10-17T05:00:00Z_352 |              0 |          85842.69921875 |                       0 |
| 433D64C871AE4E46A0E1BFCE2BB69BA7 | UNKNOWN_0_2011-11-14T05:00:00Z_364 |              0 |          85842.69921875 |                       0 |
| 9545DEF1666B5F4D8626F19F8E9E9333 | UNKNOWN_0_2012-03-07T22:19:18Z_418 |          10948 |          85842.69921875 |                       0 |
| 244D7D89B79E0F4E91100E4ADB300656 | UNKNOWN_0_2012-04-27T20:33:26Z_439 |          50945 |          96790.69921875 |                       0 |
| 115A427BBB1D2C43BA11D9E5875FAA2C | UNKNOWN_0_2012-07-20T16:17:54Z_465 |         480049 |         147735.69921875 |                       0 |
| 3A2271EFCC767E4CA40017E68802F10C | UNKNOWN_0_2012-08-01T17:26:38Z_478 |          54298 |         627784.69921875 |                       0 |
| 1B9AFD2C20362F48A486E8A535B29AF5 |  UNKNOWN_1_2011-12-13T17:15:53Z_20 |        -113810 |                       0 |                       0 |

本质上 - 所有记录都按类别和批准字段值分组，然后按批准日期、文档编号(如果批准=真)或发布日期、文档编号(如果批准=假)排序。最后，将逐条记录的运行总和与具有相同类别和批准值的每个先前记录的值相匹配，负总和和正总和在单独的列中报告。

我可以通过子选择获得所需的结果，但性能很差(700 条记录需要 6.5 秒)。我一直在尝试将 CASE WHEN 语句与各种 GROUP BY 和 HAVING 子句结合使用，但我似乎无法获得正确的值(我无法获得确定“上一个”记录以满足我的要求的逻辑) .但是，使用这种方法的性能非常好(对于相同的数据集，大多数情况下不到 200 毫秒)。

这是我的尝试(仅限 SQLite，下面是 T-SQL)，但需要很长时间:

SELECT a.GUID, 
SUM(CASE WHEN b.Value>0 THEN b.Value ELSE 0 END) as positive_previous_total, 
SUM(CASE WHEN b.Value<0 THEN b.Value ELSE 0 END)  as negative_previous_total 
FROM Changes AS a left join Changes as b 
ON b.rowid != a.rowid 
AND b.Approved =a.Approved 
AND b.Category=a.Category 
AND ((IFNULL(SUBSTR(CASE WHEN b.Approved THEN b.ApprovedDate ELSE b.IssuedDate END, 1, 10), '0000-00-00')<IFNULL(SUBSTR(CASE WHEN a.Approved THEN a.ApprovedDate ELSE a.IssuedDate END, 1, 10), '0000-00-00') 
OR ((IFNULL(SUBSTR(CASE WHEN b.Approved THEN b.ApprovedDate ELSE b.IssuedDate END, 1, 10), '0000-00-00')=IFNULL(SUBSTR(CASE WHEN a.Approved THEN a.ApprovedDate ELSE a.IssuedDate END, 1, 10), '0000-00-00') AND b.DocumentNumber<a.DocumentNumber)))) 
GROUP BY a.rowid

这是我的尝试(T-SQL)

   SELECT 
    a.[GUID], 
    [positive_previous_total] = SUM(CASE WHEN b.Value>0 THEN b.Value ELSE 0 END), 
    [negative_previous_total] = SUM(CASE WHEN b.Value<0 THEN b.Value ELSE 0 END) 
FROM 
    #Changes a 
    LEFT OUTER JOIN #Changes b 
        ON 
        b.[GUID]    <> a.[GUID] AND
        b.Approved  = a.Approved AND
        b.Category  = a.Category 
        AND 
        (
        ISNULL(SUBSTRING(CASE WHEN b.Approved=1 THEN b.ApprovedDate ELSE b.IssuedDate END, 1, 10), '0000-00-00') 
          < ISNULL(SUBSTRING(CASE WHEN a.Approved=1 THEN a.ApprovedDate ELSE a.IssuedDate END, 1, 10), '0000-00-00')
        OR 
            (
            ISNULL(SUBSTRING(CASE WHEN b.Approved=1 THEN b.ApprovedDate ELSE b.IssuedDate END, 1, 10), '0000-00-00')
              =ISNULL(SUBSTRING(CASE WHEN a.Approved=1 THEN a.ApprovedDate ELSE a.IssuedDate END, 1, 10), '0000-00-00') 
            AND 
            b.DocumentNumber<a.DocumentNumber
            )
        ) 
GROUP BY a.[GUID]

有没有人有任何建议可以更好地获得我需要的结果？

在此先感谢您的帮助。

最佳答案

请引用您可以加快速度方面的建议HERE ON SO。

两个或三个SO权重股贡献了，所以我会在你的DBA取得联系，看看能做出什么样的变化。

似乎是共识是，你需要添加在changes表中的某些索引。

我还喜欢添加一些计算领域的这个表然后进行后续的脚本了很多更具可读性的想法。

如果你能够改变一些数据类型，然后有很多的答案建议。

关于SQLite - 帮助优化具有多个条件的先前行的聚合总数，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/14063514/

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