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我正在尝试创建一个基本上重新显示日志表以提高可读性的报告，因此所有更改都捕获在两列中，一列原始值和一列当前值列，其中一个属性列标记了更改的内容。

为了便于测试，我为 SQL Server 创建了一个临时表。

declare @T table (Utility_ID int,   
                  Utility_Record_ID int,    
                  Organization_Name nvarchar(255), 
                  Facility_Name nvarchar(255),  
                  Space_Name nvarchar(255), 
                  Utility_Name nvarchar(255),   
                  MeterNumber nvarchar(255),    
                  Data_Type nvarchar(255),  
                  Reading decimal(18,2),    
                  Consumption decimal(18,2),    
                  Begin_Date datetime,  
                  End_Date datetime,    
                  [Estimated/Actual] nvarchar(255), 
                  [Date-Time Of Change] datetime,   
                  [changed By] nvarchar(100),   
                  [Change Type] nVarchar(100)
)

insert into @T 
select 11819,   38503,  'The Men Who Stare At Goats', 'BuildingA', NULL, 'Electricty for BuildingA',    '9615(small meter)',    'Reading',  2369,   9.00,   '2011 -06-30 00:00:00:000', NULL,       'Actual',   '2012-03-07 09:26:53.590',  'Billy.Bob',    'Insert'    
union all
select 11819,   38503,  'The Men Who Stare At Goats', 'BuildingA', NULL, 'Electricty For BuildingA',    '9615(small meter)',    'Reading',  2372,   12.00,  '2011 -06-30 00:00:00:000', NULL,       'Actual',   '2012-05-01 10:30:40:237',  'Billy.Jean',   'Update'    
union all
select 2000,    12345,  'Hotel', 'Fun House', 'My Gaff', 'Water For My Gaff',   '987654321',    'Consumption',  NULL,   500.00, '2011 -06-30 00:00:00:000', '2011 -08-30 00:00:00:000',     'Actual',   '2013-05-01 10:30:40:237',  'Billy.NoMates',    'Insert'

我的障碍是我正在跟踪 c.Reading、c.Consumption、估计/实际、开始日期和结束日期的变化。如果其他字段值被更改，或者被另一个字段更改，我如何实现其他字段值以拉入 CurrentValue 和 PreviousValue 列？

我在下面尝试跟踪一列 [c.Consumption] 我已按 ID 分区并按记录的更改日期时间排序。

-- Get CurrentValue and PreviousValue with a Changed column  
;with cte as
(
  select *,
    row_number() over(partition by Utility_Record_ID order by [Date-Time Of Change]) as rn
  from @T
)
select
C.Utility_ID ,  
C.Utility_Record_ID,
C.Organization_Name,
C.Facility_Name,
C.Space_Name,
C.Utility_Name,
C.MeterNumber,
C.Data_Type,
C.Reading,
C.Consumption,
C.Begin_Date,
C.End_Date,
C.[Estimated/Actual],
C.[Date-Time Of Change],
C.[changed By],
C.[Change Type],
C.Consumption as CurrentValue,
P.Consumption as PreviousValue,
  case C.Consumption when P.Consumption then 0 else 1 end as Changed
from cte as C
  LEFT OUTER JOIN cte as P
    on C.Utility_Record_ID = P.Utility_Record_ID and
       C.rn = P.rn + 1

这个问题是，我使用的是只读访问帐户，因此没有触发器或视图。这一定是选择查询的纯粹和简单。

4

1 回答 1

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它不漂亮，但假设您正在监视的列是固定的，那么您可以使用 case 语句对检查进行硬编码。这也假设只有 1 个跟踪字段可以在 2 个版本的记录之间更改。

-- Get CurrentValue and PreviousValue with a Changed column  
;with cte as
(
  select *,
    row_number() over(partition by Utility_Record_ID order by [Date-Time Of Change]) as rn
  from @T
)
select
C.Utility_ID ,  
C.Utility_Record_ID,
C.Organization_Name,
C.Facility_Name,
C.Space_Name,
C.Utility_Name,
C.MeterNumber,
C.Data_Type,
C.Reading,
C.Consumption,
C.Begin_Date,
C.End_Date,
C.[Estimated/Actual],
C.[Date-Time Of Change],
C.[changed By],
C.[Change Type],
case 
  when C.Reading <> P.Reading  then 'Reading'
  when C.Consumption <> P.Consumption then 'Consumption'
  when C.[Estimated/Actual] <> P.[Estimated/Actual] then '[Estimated/Actual]'
  when C.Begin_Date <> P.Begin_Date then 'Begin_Date'
  when C.End_Date <> P.End_Date then 'End_Date'
end WhatChanged,
case 
  when C.Reading <> P.Reading  then C.Reading
  when C.Consumption <> P.Consumption then C.Consumption
  when C.[Estimated/Actual] <> P.[Estimated/Actual] then C.[Estimated/Actual]
  when C.Begin_Date <> P.Begin_Date then C.Begin_Date
  when C.End_Date <> P.End_Date then C.End_Date
end CurrentValue,
case 
  when C.Reading <> P.Reading  then P.Reading
  when C.Consumption <> P.Consumption then P.Consumption
  when C.[Estimated/Actual] <> P.[Estimated/Actual] then P.[Estimated/Actual]
  when C.Begin_Date <> P.Begin_Date then P.Begin_Date
  when C.End_Date <> P.End_Date then P.End_Date
end PreviousValue
from cte as C
  LEFT OUTER JOIN cte as P
    on C.Utility_Record_ID = P.Utility_Record_ID and
       C.rn = P.rn + 1
于 2013-11-12T15:10:51.503 回答