Tsql ivotedWithLastValue，其中val LastVal或LastVal为NULL 按Id订购，beginT

在这个查询中，我使用了LAG（）函数来获取每个字段的最后一个值。根据此值，您可以在最终查询中筛选出未更改的记录，如上所示。

据我所知，我必须创建两个临时表，并通过筛选将它们合并

a.id=b.id和a.field=b.field和a.rn=b.rn-1和a.valueb.value

。我说的对吗？您不需要创建任何临时表；您只需参考两次CTE（历史2）。看看建议的查询。您的示例返回了几个错误：

关键字“with.”附近的语法不正确。

和

附近的语法不正确，“

我也不理解历史中的查询2。据我所知，

unpivot

应用于结果表，但在历史记录2中没有任何表。没有测试查询，因为我没有您的表的示例。。。我现在已经纠正了错误；尝试执行已更改的查询。History2 CTE只是原始查询的副本，并添加了一些列（id，rn）。谢谢。查询工作正常，但不正常。我更新一个字段2次，另一个字段1次。查询不返回上次更新的上次结果，但显示上次

endT

…如果在

中使用历史记录作为（

使用

其中cz.id='some id'

。在这种情况下，结果是

LastVal

С对应于实际值。但是如果

其中
包含多个id或
其中不存在
则
LastVal
的值是混合的。您使用cz.id列的目的是什么？如果没有数据样本，这很难回答。对不起。请看。我补充了我的问题。啊哈-我明白了。我简化了我的查询有点太多：-）我现在在示例中添加了一个id列。您应该在LAG（）中的PARTITION BY子句中添加cz.id语句。如果这不能解决问题，请告诉我。太好了！关于您的其他问题：如果我理解正确，那么可以创建一个存储过程来输出多个表的更改。它可能需要一点动态SQL，并且可能会变得更复杂，具体取决于您的具体要求。
with History AS (
SELECT
cz.GUID as Id, 
cz.category,
isnull(cz.area, 0) as area, 
isnull(cz.oilwidthmin,0) as oilwidthmin, 
isnull(cz.oilwidthmax,0) as oilwidthmax, 
isnull(cz.efectivwidthmin,0) as efectivwidthmin,
isnull(cz.efectivwidthmax,0) as efectivwidthmax,
isnull(cz.koafporistmin,0) as koafporistmin, 
isnull(cz.koafporistmax,0) as koafporistmax,
CASE cz.__$operation 
WHEN 1 THEN 'DELETE'
WHEN 2 THEN 'INSERT'
WHEN 3 THEN 'Before UPDATE'
WHEN 4 THEN 'After UPDATE'
END operation,
map.tran_begin_time as beginT, 
map.tran_end_time as endT
FROM cdc.fn_cdc_get_all_changes_dbo_EXT_GeolObject_KategZalezh(sys.fn_cdc_get_min_lsn('dbo_EXT_GeolObject_KategZalezh'), sys.fn_cdc_get_max_lsn(), 'all') AS cz 
INNER JOIN  [cdc].[lsn_time_mapping] map
    ON cz.[__$start_lsn] = map.start_lsn
)
SELECT  field, val, operation, beginT, endT FROM History
unpivot ( [val] for field in
(
--category,
area, 
oilwidthmin, 
oilwidthmax, 
efectivwidthmin, 
efectivwidthmax, 
koafporistmin, 
koafporistmax))t    where id = '2D166098-7CBD-4622-9EB0-000070506FE6'   

WITH History AS (
    SELECT
        *,
        CASE cz.__$operation 
            WHEN 1 THEN 'DELETE'
            WHEN 2 THEN 'INSERT'
            WHEN 3 THEN 'Before UPDATE'
            WHEN 4 THEN 'After UPDATE'
            END operation,
        map.tran_begin_time as beginT, 
        map.tran_end_time as endT
    FROM cdc.fn_cdc_get_all_changes_dbo_EXT_GeolObject_KategZalezh(sys.fn_cdc_get_min_lsn('dbo_EXT_GeolObject_KategZalezh'), sys.fn_cdc_get_max_lsn(), 'all') AS cz 
        INNER JOIN  [cdc].[lsn_time_mapping] map
            ON cz.[__$start_lsn] = map.start_lsn
    where cz.GUID = '2D166098-7CBD-4622-9EB0-000070506FE6'
),
UnpivotedValues AS(
    SELECT  guid, field, val, operation, beginT, endT 
    FROM History
        UNPIVOT ( [val] FOR field IN
        (
            area, 
            oilwidthmin, 
            oilwidthmax, 
            efectivwidthmin, 
            efectivwidthmax, 
            koafporistmin, 
            koafporistmax
        ))t
),
UnpivotedWithLastValue AS (
    SELECT 
        *,
        --Use LAG() to get the last value for the same field
        LAG(val, 1) OVER (PARTITION BY field ORDER BY BeginT) LastVal
    FROM UnpivotedValues
)
--Filter out record where the value equals the last value for the same field
SELECT * FROM UnpivotedWithLastValue WHERE val <> LastVal OR LastVal IS NULL ORDER BY guid

WITH 
History AS 
(
SELECT
    cz.GUID as Id, 
    cz.category,
    isnull(cz.area, 0) as area, 
    isnull(cz.oilwidthmin,0) as oilwidthmin, 
    isnull(cz.oilwidthmax,0) as oilwidthmax, 
    isnull(cz.efectivwidthmin,0) as efectivwidthmin,
    isnull(cz.efectivwidthmax,0) as efectivwidthmax,
    isnull(cz.koafporistmin,0) as koafporistmin, 
    isnull(cz.koafporistmax,0) as koafporistmax,
    CASE 
        cz.__$operation 
        WHEN 1 THEN 'DELETE'
        WHEN 2 THEN 'INSERT'
        WHEN 3 THEN 'Before UPDATE'
        WHEN 4 THEN 'After UPDATE'
    END operation,
    map.tran_begin_time as beginT, 
    map.tran_end_time as endT,
    ROW_NUMBER() OVER (PARTITION BY cz.GUID ORDER BY map.tran_end_time ASC) as rn
FROM 
    cdc.fn_cdc_get_all_changes_dbo_EXT_GeolObject_KategZalezh(sys.fn_cdc_get_min_lsn('dbo_EXT_GeolObject_KategZalezh'), sys.fn_cdc_get_max_lsn(), 'all') AS cz 
INNER JOIN  
    [cdc].[lsn_time_mapping] map ON cz.[__$start_lsn] = map.start_lsn
),

History2 AS
(
    SELECT  id, field, val, operation, beginT, endT, rn FROM History
    unpivot ( [val] for field in
    (
    --category,
    area, 
    oilwidthmin, 
    oilwidthmax, 
    efectivwidthmin, 
    efectivwidthmax, 
    koafporistmin, 
    koafporistmax))t    
    where id = '2D166098-7CBD-4622-9EB0-000070506FE6'
)

-- return the values that were inserted first
SELECT
    a.*
FROM
    History2 a
WHERE 
    a.rn=1

UNION ALL

-- ... and then return only the values that are different from the previous ones
SELECT
    a.*
FROM
    History2 a
INNER JOIN
    History2 b ON a.id = b.id AND a.field=b.field AND a.rn = b.rn-1 AND a.value<>b.value
WHERE
    a.rn>1

WITH History AS (
    SELECT
        *,
        CASE cz.__$operation 
            WHEN 1 THEN 'DELETE'
            WHEN 2 THEN 'INSERT'
            WHEN 3 THEN 'Before UPDATE'
            WHEN 4 THEN 'After UPDATE'
            END operation,
        map.tran_begin_time as beginT, 
        map.tran_end_time as endT
    FROM cdc.fn_cdc_get_all_changes_Dbo_YourTable(sys.fn_cdc_get_min_lsn('Dbo_YourTable'), sys.fn_cdc_get_max_lsn(), 'all') AS cz 
        INNER JOIN  [cdc].[lsn_time_mapping] map
            ON cz.[__$start_lsn] = map.start_lsn
),
UnpivotedValues AS(
    SELECT id, field, val, operation, beginT, endT, t.tran_id
    FROM History
        UNPIVOT ( [val] FOR field IN
        (Column1, Column2, Column3))t
),
UnpivotedWithLastValue AS (
    SELECT 
        *,
        --Use LAG() to get the last value for the same field
        LAG(val, 1) OVER (PARTITION BY id, field ORDER BY BeginT) LastVal
    FROM UnpivotedValues
)
--Filter out record where the value equals the last value for the same field
SELECT * FROM UnpivotedWithLastValue WHERE val <> LastVal OR LastVal IS NULL
ORDER BY Id, beginT